Schedule III - Consolidated Real Estate and Accumulated Depreciation Reconciliation of Real Estate Assets and Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real estate assets Balance, beginning of period	$ 3,132,078	$ 3,066,297	$ 2,799,010
Additions - property acquisitions	73,273	8,600	0
Additions - improvements	344,960	221,588	267,357
Deductions - write offs	(95,077)	(164,407)	70
Real estate assets Balance, end of period	3,455,234	3,132,078	3,066,297
Accumulated depreciation Balance, beginning of period	560,837	504,869	413,394
Additions - depreciation	102,614	97,988	91,545
Deductions - write offs	(1,268)	(42,020)	70
Accumulated depreciation Balance, end of period	$ 662,183	$ 560,837	$ 504,869