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Earnings Per Common Share - Computation of basic and diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic earnings per common share:
Net income	$ 186,483	$ 178,871	$ 87,554
Weighted-average basic common shares	34,561	36,530	29,686
Basic earnings per common share (in dollars per share)	$ 5.40	$ 4.90	$ 2.95
Diluted earnings per share:
Net income	$ 186,483	$ 178,871	$ 87,554
Weighted-average basic common shares	34,561	36,530	29,686
Effect of dilutive securities (in shares)	236	246	236
Weighted-average dilutive shares	34,797	36,776	29,922
Diluted earnings per common share (in dollars per share)	$ 5.36	$ 4.86	$ 2.93

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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