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Stockholders' Equity (Common shares held in treasury, activity) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 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) (45,810) (51,078)
End of period 8,712,150 7,961,176
Beginning of period $ 105,379 $ 97,070
Common shares used for exercise of restricted stock units (Value) (505) (575)
End of period $ 104,874 $ 96,495