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Long-Term Debt and Credit Facility - Senior Term Loan (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 17, 2015
Sep. 02, 2014
Dec. 31, 2015
Dec. 31, 2014
Long-term Debt        
Loss on early extinguishment of debt     $ (703) $ (476)
Senior Term Loan        
Long-term Debt        
Amount outstanding     $ 0  
Amount repaid $ 158,420      
Loss on early extinguishment of debt $ (703) $ (476)