Fair Value Measurements - Fair Value of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair value of other financial instruments
Note receivable	$ 0	$ 16,618
Credit facility	(243,163)	(643,742)
Notes payable	(619,972)	(224,330)
Carrying amount \| Recurring basis
Fair value of other financial instruments
Real estate loans receivable	40,258	39,154
Note receivable	0	16,618
Credit facility	(250,000)	(651,000)
Notes payable	(625,000)	(225,000)
Mortgage debt	(143,749)	(123,632)
Carrying amount \| Interest Rate Swap \| Recurring basis
Fair value of other financial instruments
Derivative assets	15,303	13,881
Carrying amount \| Embedded derivatives \| Recurring basis
Fair value of other financial instruments
Derivative liabilities	0	(5,571)
Fair value \| Recurring basis
Fair value of other financial instruments
Real estate loans receivable	39,520	39,154
Note receivable	0	16,618
Credit facility	(250,000)	(651,000)
Notes payable	(619,763)	(214,584)
Mortgage debt	(146,627)	(125,420)
Fair value \| Interest Rate Swap \| Recurring basis
Fair value of other financial instruments
Derivative assets	15,303	13,881
Fair value \| Embedded derivatives \| Recurring basis
Fair value of other financial instruments
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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Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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- Definition

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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- Definition

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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