Fair Value Measurements - Fair Value Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Note receivable	$ 20,628	$ 0
Liabilities:
Credit facility	(457,388)	(324,394)
Notes payable	(966,961)	(966,603)
Carrying Amount
Assets:
Real estate loans receivable	55,659	76,195
Note receivable	20,628	0
Liabilities:
Credit facility	(465,000)	(330,000)
Notes payable	(975,000)	(975,000)
Mortgage debt	(108,859)	(186,939)
Carrying Amount \| Derivative assets
Assets:
Derivative assets	15,121	14,693
Fair Value
Assets:
Real estate loans receivable	54,782	75,288
Note receivable	20,628	0
Liabilities:
Credit facility	(465,000)	(330,000)
Notes payable	(914,918)	(970,975)
Mortgage debt	(107,131)	(185,743)
Fair Value \| Derivative assets
Assets:
Derivative assets	$ 15,121	$ 14,693

Secured Loans on Real Estate, Loan Balance

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Fair value portion of notes payable.

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Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

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