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Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Stockholders' Equity Note [Abstract]      
Beginning of period   8,757,960 8,012,254
Common shares used for exercise of restricted stock units (Shares)   (45,810) (58,279,000)
Common shares repurchased as part of the stock repurchase program (Shares)   0 303,985
Reclassification from common stock (shares)   0  
End of period 8,257,960 8,712,150 8,257,960
Beginning of period   $ 105,379 $ 97,070
Common shares used for exercise of restricted stock units (Value)   (505) (640)
Stock purchased under the repurchase program $ 4,200 0 4,238
End of period $ 100,668 $ 104,874 $ 100,668