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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Total revenue	$ 481,208	$ 429,878	$ 419,972	$ 449,800	$ 480,205	$ 435,412	$ 416,629	$ 447,576	$ 1,780,858	$ 1,779,822	$ 1,088,377
Total cost of revenue	219,208	192,620	191,544	210,719	231,069	204,366	192,205	204,676	814,091	832,316	483,574
Net revenue	262,000	237,258	228,428	239,081	249,136	231,046	224,424	242,900	966,767	947,506	604,803
Total expenses and other income	198,824	193,175	186,157	183,302	192,101	189,479	202,956	190,658	761,458	775,194	511,356
Net income	$ 48,075	$ 33,325	$ 30,171	$ 41,635	$ 67,734	$ 28,274	$ 15,239	$ 32,645	$ 153,206	$ 143,892	$ 60,127
Diluted income per share:
Net income per diluted share (in dollars per share)	$ 1.09	$ 0.76	$ 0.67	$ 0.90	$ 1.43	$ 0.59	$ 0.32	$ 0.67	$ 3.41	$ 3.00	$ 1.72
Diluted weighted-average shares	43,936	44,116	45,043	46,479	47,212	47,668	48,289	48,402	44,884	47,888	35,004

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