Fair Value Measurements - Fair Value Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Notes receivable	$ 0	$ 16,618
Liabilities:
Credit facility	(324,394)	(643,742)
Notes payable	(966,603)	(224,330)
Recurring \| Reported Value Measurement
Assets:
Real estate loans receivable	76,195	39,154
Notes receivable	0	16,618
Liabilities:
Credit facility	(330,000)	(651,000)
Notes payable	(975,000)	(225,000)
Mortgage debt	(186,939)	(123,632)
Recurring \| Reported Value Measurement \| Interest Rate Swaps
Assets:
Derivative assets	14,693	13,881
Recurring \| Reported Value Measurement \| Embedded Derivative Financial Instruments
Liabilities:
Derivative liabilities	0	(5,571)
Recurring \| Estimate of Fair Value Measurement
Assets:
Real estate loans receivable	75,288	39,154
Notes receivable	0	16,618
Liabilities:
Credit facility	(330,000)	(651,000)
Notes payable	(970,975)	(214,584)
Mortgage debt	(185,743)	(125,420)
Recurring \| Estimate of Fair Value Measurement \| Interest Rate Swaps
Assets:
Derivative assets	14,693	13,881
Recurring \| Estimate of Fair Value Measurement \| Embedded Derivative Financial Instruments
Liabilities:
Derivative liabilities	$ 0	$ (5,571)

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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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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