Fair Value Measurements (Details)	Sep. 30, 2016 USD ($) instruments	Dec. 31, 2015 USD ($)
Fair value of other financial instruments
Outstanding interest rate swap contracts designated as cash flow hedges \| instruments	6
Notes receivable	$ 16,618,000	$ 20,620,000
Derivative assets		0
Credit facility	(448,321,000)	(389,375,000)
Notes payable	(224,339,000)	0
Fair value, measurements, nonrecurring
Fair value of other financial instruments
Assets subject to impairment fair value disclosure	$ 0
Interest Rate Swap
Fair value of other financial instruments
Outstanding interest rate swap contracts designated as cash flow hedges \| instruments	5
Embedded derivatives
Fair value of other financial instruments
Outstanding interest rate swap contracts designated as cash flow hedges \| instruments	1
Carrying amount \| Recurring basis
Fair value of other financial instruments
Real estate loans receivable	$ 43,817,000	39,349,000
Notes receivable	16,618,000	20,620,000
Credit facility	(456,000,000)	(395,000,000)
Notes payable	(225,000,000)	0
Mortgage debt	(114,278,000)	(94,600,000)
Carrying amount \| Interest Rate Swap \| Recurring basis
Fair value of other financial instruments
Derivative assets	652,000	0
Carrying amount \| Embedded derivatives \| Recurring basis
Fair value of other financial instruments
Derivative liabilities	(6,192,000)	(8,216,000)
Fair value \| Recurring basis
Fair value of other financial instruments
Real estate loans receivable	43,817,000	39,349,000
Notes receivable	16,618,000	20,620,000
Credit facility	(456,000,000)	(395,000,000)
Notes payable	(232,154,000)	0
Mortgage debt	(116,413,000)	(95,275,000)
Fair value \| Interest Rate Swap \| Recurring basis
Fair value of other financial instruments
Derivative assets	652,000	0
Fair value \| Embedded derivatives \| Recurring basis
Fair value of other financial instruments
Derivative liabilities	$ (6,192,000)	$ (8,216,000)

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

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