Schedule III - Real Estate and Accumulated Depreciation - Reconciliation of Accumulated Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance, beginning of year	$ 465,584	$ 377,552	$ 295,351
Depreciation expense	106,343	108,319	89,505
Disposals	(15,381)	(20,287)	(7,304)
Balance, end of year	$ 556,546	$ 465,584	$ 377,552