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Quarterly Operating Results (Unaudited) - Schedule of Quarterly Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 578,989	$ 618,683	$ 575,219	$ 619,280	$ 508,748	$ 530,850	$ 473,187	$ 501,461	$ 2,392,171	$ 2,014,246	$ 1,881,347
Total expenses	476,940	466,845	451,697	470,760	408,137	388,350	372,277	383,020	1,866,242	1,551,784	1,431,625
Income before income taxes	102,049	151,838	123,522	148,520	100,611	142,500	100,910	118,441	525,929	462,462	449,722
Net income	$ 76,519	$ 115,506	$ 92,593	$ 113,896	$ 73,452	$ 106,053	$ 73,922	$ 90,828	$ 398,514	$ 344,255	$ 399,630
Net income per share:
Basic	$ 0.27	$ 0.41	$ 0.33	$ 0.41	$ 0.26	$ 0.38	$ 0.27	$ 0.33	$ 1.42	$ 1.24	$ 1.43
Diluted	$ 0.27	$ 0.41	$ 0.33	$ 0.40	$ 0.26	$ 0.38	$ 0.26	$ 0.32	$ 1.40	$ 1.22	$ 1.40

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