Business Combinations (Transactions Related to Acquisitions) (Details) - USD ($) $ in Thousands		1 Months Ended		12 Months Ended
	Feb. 12, 2016	Sep. 30, 2016	Feb. 29, 2016	Dec. 31, 2016
Liabilities:
Proceeds from business acquisition			$ 2,500
Business Combination Achieved in Stages [Member]
Business Acquisition [Line Items]
Fair value of our equity interest before business combination	$ 22,514
Gain recognized on equity interest remeasured to fair value	37,383		$ 37,400
Assets:
Property	58,665
Unamortized lease costs	8,936
Accrued rent and accounts receivable	102
Cash and cash equivalents	3,555
Other, net	4,992
Liabilities:
Debt, net	(48,727)
Accounts payable and accrued expenses	(1,339)
Other, net	(3,670)
Total net assets	22,514
Proceeds from business acquisition	$ 2,500
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Fair value of our equity interest before business combination		$ 13,500		$ 13,579
Gain recognized on equity interest remeasured to fair value		$ 9,000
Fair value of consideration transferred				443,745
Acquisition costs (included in operating expenses)				936
Gain on acquisition				9,015
Assets:
Property				433,055
Unamortized lease costs				80,951
Accrued rent and accounts receivable				122
Cash and cash equivalents				556
Other, net				6,812
Liabilities:
Accounts payable and accrued expenses				(6,383)
Other, net				(62,254)
Total net assets				$ 452,859