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Long-Term Debt and Credit Facility (Maturities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Term Loan    
2017 $ 40,566  
2018 2,000  
2019 2,000  
2020 3,833  
Long-term debt 48,399 $ 50,546
Revolving Credit Facility    
Term Loan    
2017 38,566  
2018 0  
2019 0  
2020 0  
Long-term debt 38,566 25,148
Term loan    
Term Loan    
2017 2,000  
2018 2,000  
2019 2,000  
2020 3,833  
Long-term debt $ 9,833 $ 25,398