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Selected Quarterly Financial Data (Unaudited) - Schedule of Selected Quarterly Financial Data (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]
Total revenues	$ 164,346	$ 169,312	$ 168,512	$ 159,957	$ 156,565	$ 159,899	$ 156,624	$ 153,174	$ 662,127	$ 626,262	$ 633,106
Cost of revenues and operations	26,443	24,034	22,804	19,086	15,923	18,176	15,540	15,902	92,367	65,541	56,794
Operating income	23,870	28,331	24,557	7,166	38,828	39,374	28,873	27,181	83,924	134,256	176,650
Net income	$ 9,357	$ 15,797	$ 12,726	$ 929	$ 151,758	$ 20,988	$ 24,809	$ 26,888	$ 38,809	$ 224,443	$ 176,370
Earnings per share, basic	$ 0.14	$ 0.23	$ 0.18	$ 0.01	$ 2.12	$ 0.29	$ 0.35	$ 0.38	$ 0.55	$ 3.13	$ 2.46
Earnings per share, diluted	$ 0.14	$ 0.23	$ 0.18	$ 0.01	$ 2.11	$ 0.29	$ 0.35	$ 0.38	$ 0.55	$ 3.13	$ 2.46

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