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Quarterly Operating Results (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 Data [Abstract]
Total revenue	$ 223,407	$ 220,818	$ 237,949	$ 181,530	$ 207,037	$ 223,486	$ 243,272	$ 196,210	$ 863,704	$ 870,005	$ 896,558
Total operating expenses	189,031	176,589	200,012	168,011	171,519	189,168	192,621	176,914	733,643	730,222	739,088
Operating income	34,376	44,229	37,937	13,519	35,518	34,318	50,651	19,296
Net income	24,006	31,443	28,009	4,338	24,772	21,623	36,595	8,887	$ 87,784	$ 91,877	$ 114,796
Net income attributable to common stockholders	$ 23,994	$ 31,443	$ 28,009	$ 4,338	$ 24,772	$ 21,623	$ 36,595	$ 8,887
Net income per share available to common stockholders - basic (in dollars per share)	$ 0.12	$ 0.15	$ 0.14	$ 0.02	$ 0.12	$ 0.11	$ 0.18	$ 0.04	$ 0.43	$ 0.46	$ 0.57
Net income per share available to common stockholders - diluted (in dollars per share)	$ 0.12	$ 0.15	$ 0.14	$ 0.02	$ 0.12	$ 0.11	$ 0.18	$ 0.04	$ 0.43	$ 0.46	$ 0.57

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