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Stockholders' Equity (Activity of Common Shares Held in Treasury) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Stockholders' Equity Note [Abstract]    
Beginning of period 8,498,163 8,486,278
Common shares used upon lapse of restricted stock units and options (Shares) (275,086) (120,630)
Common shares repurchased as part of the stock repurchase program (Shares) 1,684,921 175,000
End of period 9,907,998 8,540,648
Beginning of period $ 102,949 $ 102,339
Common shares used upon lapse of restricted stock units and options (Value) (2,248) (1,470)
Common shares repurchased as part of the stock repurchase program (Value) 40,161 2,226
End of period $ 140,862 $ 103,095