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Stockholders' Equity (Common shares held in treasury, activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stockholders' Equity Note [Abstract]    
Beginning of period 7,030,101 7,090,597
Common shares used for exercise of restricted stock units (Shares) (27,752) (33,600)
Common shares repurchased as part of the stock repurchase program (Shares) 707,400 0
Common shares used to match defined contribution plan, net 0 (7,318)
End of period 7,709,749 7,049,679
Beginning of period $ 80,642 $ 81,275
Common shares used for exercise of restricted stock units (Value) (292) (351)
Stock purchased under the repurchase program 10,393 0
Common shares used to match defined contribution plan, net (Value) 0 (77)
End of period $ 90,743 $ 80,847