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Earnings Per Common Share - Schedule of Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 68,017	$ 48,424
Denominator:
Weighted-average number of common shares outstanding-basic	69,293	67,239
Effect of dilutive securities:
Performance and restricted stock awards	213	142
Weighted-average number of common shares outstanding-diluted	69,506	67,381
Earnings per common share:
Basic	$ 0.98	$ 0.72
Diluted	$ 0.98	$ 0.72

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