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Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stockholders' Equity Note [Abstract]    
Beginning of period 8,591,310 8,678,427
Common shares used for exercise of restricted stock units (Shares) (34,507) (20,900)
End of period 8,556,803 8,657,527
Beginning of period $ 103,633 $ 104,502
Common shares used for exercise of restricted stock units (Value) (437) (360)
End of period $ 103,196 $ 104,142