Fair Value Measurements - Fair Value of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets:
Note receivable	$ 22,705	$ 22,694
Liabilities:
Credit facility	(404,838)	(583,323)
Notes payable	(968,001)	(967,789)
Mortgage debt	(59,354)	(83,341)
Carrying Amount
Assets:
Real estate loans receivable	135,818	178,240
Note receivable	22,705	22,694
Liabilities:
Credit facility	(410,000)	(589,000)
Notes payable	(975,000)	(975,000)
Mortgage debt	(59,608)	(83,613)
Carrying Amount | Interest Rate Swap
Assets:
Derivative assets	0	4,933
Liabilities:
Derivative liabilities	(5,071)
Carrying Amount | Embedded Derivative Financial Instruments
Liabilities:
Derivative liabilities	(10,340)	(4,290)
Fair Value
Assets:
Real estate loans receivable	138,320	178,095
Note receivable	22,705	22,694
Liabilities:
Credit facility	(410,000)	(589,000)
Notes payable	(1,082,468)	(1,003,385)
Mortgage debt	(58,733)	(85,110)
Fair Value | Interest Rate Swap
Assets:
Derivative assets	0	4,933
Fair Value | Embedded Derivative Financial Instruments
Liabilities:
Derivative liabilities	$ (10,340)	$ (4,290)