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Stockholders' Equity (Activity of Common Shares Held in Treasury) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stockholders' Equity Note [Abstract]      
Beginning of period 8,486,278 8,591,310 8,678,427
Common shares used upon lapse of restricted stock units and options (Shares) (163,115) (105,032) (87,117)
Common shares repurchased as part of the stock repurchase program (Shares) 175,000 0 0
End of period 8,498,163 8,486,278 8,591,310
Beginning of period $ 102,339 $ 103,633 $ 104,502
Common shares used upon lapse of restricted stock units and options (Value) (1,616) (1,294) (869)
Common shares repurchased as part of the stock repurchase program (Value) 2,226 0 0
End of period $ 102,949 $ 102,339 $ 103,633