Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Basic and Diluted Earnings:
Net income	$ 34,091	$ 3,953
Basic weighted-average shares outstanding (in shares)	32,829	33,691
Add: Stock awards (in shares)	108	114
Diluted weighted-average shares outstanding (in shares)	32,937	33,805
Basic earnings per share:
Earnings per common share - basic (in dollars per share)	$ 1.04	$ 0.12
Diluted earnings per share:
Earnings per common share - diluted (in dollars per share)	$ 1.04	$ 0.12
Antidilutive securities excluded from calculating earnings
Number of antidilutive options (in shares)	679	775

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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