SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Reconciliation of Real Estate Properties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance at beginning of year	$ 2,736,283	$ 2,208,595	$ 1,819,053
Other improvements	152,129	162,760	162,827
Property acquisitions	761,400	418,396	299,793
Property dispositions or held for sale assets	(134,332)	(66,359)	(73,078)
Prior year purchase price allocation adjustments	(9,844)	0	0
Deconsolidation of Previously Consolidated Investments	(123,636)	0	0
Deconsolidation of Previously Consolidated Investments	0	12,891	0
Balance at end of year	$ 3,382,000	$ 2,736,283	$ 2,208,595