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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, 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
Accounting Policies [Abstract]
Net income	$ 48,075	$ 33,325	$ 30,171	$ 41,635	$ 67,734	$ 28,274	$ 15,239	$ 32,645	$ 153,206	$ 143,892	$ 60,127
Weighted-average common shares for calculating basic earnings per share									44,777	47,854	34,997
Stock options and restricted stock unit awards									107	34	7
Weighted-average common shares for calculating diluted earnings per share	43,936	44,116	45,043	46,479	47,212	47,668	48,289	48,402	44,884	47,888	35,004
Basic (in dollars per share)									$ 3.42	$ 3.01	$ 1.72
Diluted (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

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