Fair Value Measurements (Details)	Jun. 30, 2016 USD ($) instruments	Dec. 31, 2015 USD ($)
Fair value of other financial instruments
Derivative, number of instruments held \| instruments	1
Real estate loans receivable	$ 38,774,000	$ 39,349,000
Note receivable	16,618,000	20,620,000
Credit facility	(369,685,000)	(389,375,000)
Notes payable	(149,561,000)	0
Fair value, measurements, nonrecurring
Fair value of other financial instruments
Assets subject to impairment fair value disclosure	$ 0
Embedded derivatives
Fair value of other financial instruments
Derivative, number of instruments held \| instruments	1
Carrying amount
Fair value of other financial instruments
Real estate loans receivable	$ 38,774,000	39,349,000
Note receivable	16,618,000	20,620,000
Credit facility	(378,000,000)	(395,000,000)
Notes payable	(150,000,000)	0
Mortgage debt	(114,893,000)	(94,600,000)
Carrying amount \| Recurring basis
Fair value of other financial instruments
Derivative liabilities	(6,211,000)	(8,216,000)
Fair value
Fair value of other financial instruments
Real estate loans receivable	38,774,000	39,349,000
Note receivable	16,618,000	20,620,000
Credit facility	(378,000,000)	(395,000,000)
Notes payable	(150,000,000)	0
Mortgage debt	(117,553,000)	(95,275,000)
Fair value \| Recurring basis
Fair value of other financial instruments
Derivative liabilities	$ (6,211,000)	$ (8,216,000)

Fair value of assets subject to impairment as of the balance sheet date.

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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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The number of derivative instruments of a particular group held by the entity.

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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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Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Carrying value as of the balance sheet date of notes payable (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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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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