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Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Stockholders' Equity Note [Abstract]    
Beginning of period 8,678,427 8,711,025
Common shares used for exercise of restricted stock units (Shares) (58,424) (32,598)
End of period 8,620,003 8,678,427
Beginning of period $ 104,502 $ 104,860
Common shares used for exercise of restricted stock units (Value) (796) (358)
End of period $ 103,706 $ 104,502