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Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stockholders' Equity Note [Abstract]      
Beginning of period 8,012,254 7,030,101 7,090,597
Common shares used for exercise of restricted stock units (Shares) (58,279) (36,294) (53,178)
Common shares repurchased as part of the stock repurchase program (Shares) 803,985 1,153,998  
Reclassification from common stock (shares)   135,551 0
Common shares used to match defined contribution plan, net     (7,318)
End of period 8,757,960 8,012,254 7,030,101
Beginning of period $ 97,070 $ 80,642 $ 81,275
Common shares used for exercise of restricted stock units (Value) (641) (384) 556
Stock purchased under the repurchase program 8,950 16,948 0
Reclassification from common stock   136 0
Common shares used to match defined contribution plan, net (Value)     (77)
End of period $ 105,379 $ 97,070 $ 80,642