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Stockholders' Equity (Activity of Common Shares Held in Treasury) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Stockholders' Equity Note [Abstract]    
Beginning of period 8,486,278 8,591,310
Common shares used upon lapse of restricted stock units and options (Shares) (118,276) (36,107)
Common shares repurchased as part of the stock repurchase program (Shares) 175,000 0
End of period 8,543,002 8,555,203
Beginning of period $ 102,339 $ 103,633
Common shares used upon lapse of restricted stock units and options (Value) (1,444) (462)
Common shares repurchased as part of the stock repurchase program (Value) 2,226 0
End of period $ 103,121 $ 103,171