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Stockholders' Equity (Activity of Common Shares Held in Treasury) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 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) (192,174) (103,042)
Common shares repurchased as part of the stock repurchase program (Shares) 0 175,000
End of period 8,305,989 8,558,236
Beginning of period $ 102,949 $ 102,339
Common shares used upon lapse of restricted stock units and options (Value) (1,955) (1,276)
Common shares repurchased as part of the stock repurchase program (Value) 0 2,226
End of period $ 100,994 $ 103,289