Annual report pursuant to Section 13 and 15(d)

Noncontrolling Interests In Subsidiaries (Changes In Noncontrolling Interests Of Subsidiaries) (Details)

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Noncontrolling Interests In Subsidiaries (Changes In Noncontrolling Interests Of Subsidiaries) (Details) - shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Noncontrolling Interests In Subsidiaries [Abstract]      
Balance, Beginning, Common Units 10,488,105 10,516,844 11,083,876
Redemption of common units for shares of common stock (148,662) (28,739) (567,032)
Issuance of units, Common Units 99,412    
Balance, Ending, Common Units 10,438,855 10,488,105 10,516,844
Balance, Beginning, LTIP Units 657,373
Issuance of units, LTIP Units 578,323 657,373  
Cancellation of units (4,819)    
Balance, Ending, LTIP Units 1,230,877 657,373