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Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Stockholders' Equity Note [Abstract]    
Beginning of period 8,591,310 8,678,427
Common shares used for exercise of restricted stock units (Shares) (36,107) (35,753)
End of period 8,555,203 8,642,674
Beginning of period $ 103,633 $ 104,502
Common shares used for exercise of restricted stock units (Value) (462) (533)
End of period $ 103,171 $ 103,969