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Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Stockholders' Equity Note [Abstract]    
Beginning of period 8,012,254 7,030,101
Common shares used for exercise of restricted stock units (Shares) (58,279) (36,294)
Common shares repurchased as part of the stock repurchase program (Shares) 803,985 707,500
End of period 8,757,960 7,701,307
Beginning of period $ 97,070 $ 80,642
Common shares used for exercise of restricted stock units (Value) (641) (384)
Stock purchased under the repurchase program 8,950 10,394
End of period $ 105,379 $ 90,652