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Summary of Significant Accounting Policies - Fair Value Disclosures, Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders $ 120,230 $ 120,230
Fixed rate notes payable and notes payable to trusts 3,213,588 2,758,567
Principal amount of liability components 610,314 623,863
Fair Value [Member]    
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders 125,642 128,216
Fixed rate notes receivable 53,450 86,814
Fixed rate notes payable and notes payable to trusts 2,404,996 1,828,486
Exchangeable senior notes 706,827 770,523
Carrying Value [Member]    
Fair Value of Financial Instruments [Line Items]    
Notes receivable from Preferred Operating Partnership unit holders 120,230 120,230
Fixed rate notes receivable 52,201 84,331
Fixed rate notes payable and notes payable to trusts 2,417,558 1,806,904
Principal amount of liability components $ 638,170 $ 660,364