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Revolving Credit Facility and Long-Term Debt - Principal Balances under Long-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Total long-term debt $ 324,373 $ 207,593
Less debt issuance costs (627) 0
Less current portion 10,000 10,000
Long-term portion 314,373 197,593
Term Loan    
Line of Credit Facility [Line Items]    
Total long-term debt 145,000 64,962
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Total long-term debt $ 180,000 $ 142,631