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Quarterly Financial Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 198,433	$ 180,698	$ 175,169	$ 174,118	$ 189,333	$ 190,021	$ 180,500	$ 168,285	$ 728,418	$ 728,139	$ 639,639
Total operating expense	(157,021)	(144,310)	(139,388)	(139,021)	(145,501)	(153,861)	(152,392)	(139,782)	579,740	591,536	550,232
Net income	19,257	20,270	19,691	52,563	48,944	14,510	6,954	24,153	$ 111,781	$ 94,561	$ 43,758
Net income attributable to the Company’s stockholders	$ 15,944	$ 17,367	$ 16,202	$ 48,577	$ 32,455	$ 11,064	$ 3,553	$ 20,515
Net income attributable to common stockholders' per share - basic (in dollars per share)	$ 0.10	$ 0.11	$ 0.10	$ 0.31	$ 0.21	$ 0.07	$ 0.02	$ 0.14	$ 0.63	$ 0.44	$ 0.26
Net income attributable to common stockholders' per share - diluted (in dollars per share)	$ 0.10	$ 0.11	$ 0.10	$ 0.31	$ 0.21	$ 0.07	$ 0.02	$ 0.14	$ 0.63	$ 0.44	$ 0.25

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