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Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Stockholders' Equity Note [Abstract]    
Beginning of period 8,757,960 8,012,254
Common shares used for exercise of restricted stock units (Shares) (46,935) (58,279)
Common shares repurchased as part of the stock repurchase program (Shares) 0 803,985
End of period 8,711,025 8,757,960
Beginning of period $ 105,379 $ 97,070
Common shares used for exercise of restricted stock units (Value) (519) (641)
Stock purchased under the repurchase program 0  
End of period $ 104,860 $ 105,379