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, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]
Balance at the beginning of the year	$ 187,780	$ 148,071	$ 116,866	$ 83,245	$ 50,910	$ 28,980
Depreciation and amortization	41,908	39,709	36,401	33,621	32,335	21,930
Dispositions during the year	(5,349)	0	(5,196)	0	0	0
Balance at the end of the year	$ 224,339	$ 187,780	$ 148,071	$ 116,866	$ 83,245	$ 50,910