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Quarterly Financial Data (unaudited) (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 Data (unaudited)
Revenues	$ 548,556	$ 530,902	$ 471,395	$ 466,051	$ 449,981	$ 450,698	$ 397,814	$ 381,209	$ 2,016,904	$ 1,679,702	$ 1,516,380
Income before taxes	206,417	193,787	160,536	174,944	172,028	179,382	147,409	141,319	735,685	640,138	609,530
Net income available to common stockholders	$ 161,092	$ 151,943	$ 124,034	$ 138,094	$ 138,399	$ 146,574	$ 115,211	$ 110,651	$ 575,163	$ 510,835	$ 756,152
Earnings per share:
Basic (in dollars per share)	$ 1.43	$ 1.36	$ 1.11	$ 1.24	$ 1.29	$ 1.41	$ 1.11	$ 1.07	$ 5.14	$ 4.88	$ 7.33
Diluted (in dollars per share)	$ 1.42	$ 1.34	$ 1.10	$ 1.23	$ 1.24	$ 1.32	$ 1.04	$ 1.00	$ 5.09	$ 4.60	$ 6.82

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