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Significant Accounting Policies (Stock-based Compensation) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Accounting Policies [Abstract]        
Stock-based compensation expense $ 1,011 $ 905 $ 4,334 $ 5,549