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Fair Value Measurements - Fair Value of Company's Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets [Abstract]    
Note receivable $ 20,606 $ 0
Liabilities:    
Credit facility (466,828) (324,394)
Notes payable (966,387) (966,603)
Carrying Amount | Recurring basis    
Assets [Abstract]    
Real estate loans receivable 71,529 76,195
Note receivable 20,606 0
Liabilities:    
Credit facility (472,000) (330,000)
Notes payable (975,000) (975,000)
Mortgage debt (154,766) (186,939)
Carrying Amount | Interest Rate Swap | Recurring basis    
Assets [Abstract]    
Derivative assets 18,976 14,693
Fair Value | Recurring basis    
Assets [Abstract]    
Real estate loans receivable 70,587 75,288
Note receivable 20,606 0
Liabilities:    
Credit facility (472,000) (330,000)
Notes payable (946,079) (970,975)
Mortgage debt (155,241) (185,743)
Fair Value | Interest Rate Swap | Recurring basis    
Assets [Abstract]    
Derivative assets $ 18,976 $ 14,693