Quarterly report pursuant to Section 13 or 15(d)

Revolving Credit Facility And Term Loans (Narrative) (Details)

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Revolving Credit Facility And Term Loans (Narrative) (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 27, 2021
USD ($)
May 06, 2021
USD ($)
property
Jun. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Jan. 25, 2017
USD ($)
Line of Credit Facility [Line Items]              
Loan balance         $ 2,374,947,000 $ 2,801,797,000  
Gain (Loss) from extinguishment of debt, net         (46,735,000)    
Outstanding borrowings under the facility         $ 174,000,000 25,000,000  
2017 Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Terms of dividend restriction         The Company was in compliance with its debt covenants under its revolving credit facility as of September 30, 2021.    
2017 Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Borrowing capacity under the credit facility             $ 600,000,000
Credit facility maturity month and year         January 2021    
Number of extension options | item         2    
Credit facility, extension period         6 months    
Terms of the unsecured facility         The terms of the 2017 credit facility included: (1) a four year term ending in January 2021, with two six month extension options, subject to the Company not being in default on the facility and with the payment of a fee of 7.5 basis points for each extension; (2) revolving credit loans may be made to the Company in an aggregate principal amount of up to $600 million, with a sublimit under the 2017 credit facility for the issuance of letters of credit in an amount not to exceed $60 million (subject to increase as discussed below), of which $10.6 million of letters of credit had been issued as of May 6, 2021; (3) an interest rate, based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option, if it no longer maintained a debt rating from Moody’s or S&P, or such debt ratings fell below Baa3 and BBB-, based on a defined leverage ratio; and (4) a facility fee, payable quarterly based on the Operating Partnership’s unsecured debt ratings from Moody’s or S&P, or, at the Operating Partnership’s option, if it no longer maintained a debt rating from Moody’s or S&P or such debt ratings fell below Baa3 and BBB-, based on a defined leverage ratio. In January 2021, the Company elected to exercise the first option to extend the 2017 credit facility maturity date for a period of six months. Accordingly, the term of the 2017 credit facility was extended through its termination in May 2021, with the Company’s payment of the 7.5 basis point extension fee.    
Loan period         4 years    
2017 Credit Agreement, Letter Of Credit [Member]              
Line of Credit Facility [Line Items]              
Borrowing capacity under the credit facility             $ 60,000,000
Proceeds from Letters of Credit       $ 10,600,000      
2017 Credit Facility, Extension One [Member]              
Line of Credit Facility [Line Items]              
Credit facility, extension period         6 months    
Credit facility extension fee, basis points         7.50%    
Mortgage loan, maturity month and year         May 2021    
Term Loan [Member]              
Line of Credit Facility [Line Items]              
Loan balance         $ 0 $ 0  
2021 Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Spread over LIBOR   0.0012%          
Appraisal value   $ 800,000,000          
Debt service coverage ratio         the minimum debt service coverage ratio (1.10 times until May 6, 2022, 1.20 times from May 7, 2022 through May 6, 2023, and 1.40 times thereafter    
Percentage of net cash proceeds of equity issuances           80.00%  
2021 Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Borrowing capacity under the credit facility   $ 250,000,000          
Terms of the unsecured facility         The terms of the 2021 Credit Facility included: (1) a three year term ending in May 2024; (2) revolving credit loans may be made to the Company in an aggregate principal amount of up to $250 million (subject to increase as discussed below), with a sublimit under the 2021 Credit Facility for the issuance of letters of credit in an amount not to exceed $50 million; and (3) a first priority lien in unencumbered properties of the Company with an appraised value greater than or equal to $800 million which must include the Company’s Harborside 2/3 and Harborside 5 properties; and (4) a facility fee payable quarterly equal to 35 basis points if usage of the 2021 Credit Facility is less than or equal to 50%, and 25 basis points if usage of the 2021 Credit Facility is greater than 50%.    
Loan period   3 years          
Credit facility, Maturity month and year         May 2024    
Secured debt   $ 250,000,000          
Outstanding borrowings under the facility   145,000,000          
2021 Term Loan [Member]              
Line of Credit Facility [Line Items]              
Loan balance   150,000,000          
Borrowing capacity under the credit facility   $ 150,000,000          
Terms of the unsecured facility         The terms of the 2021 Term Loan include: (1) an eighteen month term ending in November 2022; (2) a single draw of the term loan commitments up to an aggregate principal amount of $150 million; and (3) a first priority lien in unencumbered properties of the Company with an appraised value greater than or equal to $800 million which must include the Company’s Harborside 2/3 and Harborside 5 properties.    
Loan period   18 months          
Credit facility, Maturity month and year         November 2022    
Secured debt   $ 150,000,000          
Debt paid $ 27,000,000   $ 123,000,000        
2021 Credit Agreement, Letter Of Credit [Member]              
Line of Credit Facility [Line Items]              
Borrowing capacity under the credit facility   $ 50,000,000          
2021 Credit Facility, Usage Less Or Equal To Fifty Percent [Member]              
Line of Credit Facility [Line Items]              
Facility fee basis points   0.35%          
2021 Credit Facility, Usage Greater Than Fifty Percent [Member]              
Line of Credit Facility [Line Items]              
Facility fee basis points   0.25%          
Harborside 2/3 And Harborside 5 [Member] | 2021 Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Appraisal value   $ 800,000,000          
Harborside 2/3 And Harborside 5 [Member] | 2021 Term Loan [Member]              
Line of Credit Facility [Line Items]              
Appraisal value   $ 800,000,000          
Unsecured Term Loan [Member]              
Line of Credit Facility [Line Items]              
Loan balance         $ 25,000,000    
Unsecured Term Loan [Member] | Unsecured Revolving Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Outstanding borrowings under the facility         $ 174,000,000    
2017 Term Loan [Member] | 2017 Credit Facility [Member]              
Line of Credit Facility [Line Items]              
Credit facility extension fee, basis points         7.50%    
Minimum [Member] | 2021 Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Spread over LIBOR   1.25%          
Number of collateral pool properties | property   2          
Tangible net worth ratio           80.00%  
Maximum [Member] | 2021 Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Spread over LIBOR   2.75%          
Maximum collateral pool leverage ratio   40.00%          
Total leverage ratio   65.00%          
Senior Unsecured Notes [Member]              
Line of Credit Facility [Line Items]              
Loan balance           $ 575,000,000  
Unamortized deferred financing costs           $ 843,000  
Adjusted LIBO Rate [Member] | 2021 Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Spread over LIBOR   1.00%          
Overnight Bank Funding Rate [Member] | 2021 Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Spread over LIBOR   0.50%