SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION - Change in Accumulated Depreciation and Amortization of Real Estate Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance at the beginning of the year	$ 83,245	$ 50,910	$ 28,980	$ 17,398	$ 8,394	$ 1,901
Depreciation and amortization	33,621	32,335	21,930	11,582	9,004	6,493
Balance at the end of the year	$ 116,866	$ 83,245	$ 50,910	$ 28,980	$ 17,398	$ 8,394