Annual report pursuant to Section 13 and 15(d)

Commitments And Contingencies (Other) (Narrative) (Details)

v3.8.0.1
Commitments And Contingencies (Other) (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
property
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Aug. 31, 2017
USD ($)
Commitments And Contingencies [Line Items]        
Purchase price of property $ 90,068 $ 121,582 $ 94,073  
Notes Receivable 5.85 Interest Rate [Member]        
Commitments And Contingencies [Line Items]        
Notes receivable $ 45,700     $ 44,700
Interest rate 5.85%      
Purchase price of property $ 73,000      
Property Lock-Ups Expired [Member]        
Commitments And Contingencies [Line Items]        
Number of properties | property 80      
Properties aggregate net book value $ 1,000,000