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Net Income Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Net Income $ 712,486 $ 174,979 $ 80,925
Computation of basic and diluted net income per common share      
Weighted average common shares outstanding during the period (for basic calculation) 39,420 39,277 39,039
Dilutive effect of other potential common shares 226 154 203
Weighted average common shares and potential common shares (for diluted calculation) 39,646 39,431 39,242
Net income per common share - Basic $ 18.07 $ 4.45 $ 2.07
Net income (loss) per common share – Diluted $ 17.97 $ 4.44 $ 2.06
Stock Awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive stock awards 0 0 100