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Summary of Significant Accounting Policies - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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
Accounting Policies [Abstract]
Net income	$ 54,154	$ 34,761	$ 33,048	$ 42,655	$ 48,075	$ 33,325	$ 30,171	$ 41,635	$ 164,618	$ 153,206	$ 143,892
Weighted-average common shares for calculating basic earnings per share									43,020	44,777	47,854
Stock options and restricted stock unit awards									188	107	34
Weighted-average common shares for calculating diluted earnings per share	42,760	43,167	43,256	43,658	43,936	44,116	45,043	46,479	43,208	44,884	47,888
Basic (in dollars per share)									$ 3.83	$ 3.42	$ 3.01
Diluted (in dollars per share	$ 1.27	$ 0.81	$ 0.76	$ 0.98	$ 1.09	$ 0.76	$ 0.67	$ 0.90	$ 3.81	$ 3.41	$ 3.00

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