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Debt and Financing Arrangements - Schedule of debt and financing arrangements (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Debt and financing arrangements    
Capital lease obligations $ 67 $ 491
Debt issuance costs (3,098) (3,706)
Total 463,796 409,593
Less : short term debt and current portion of long term debt 38,077 61,245
Long-term debt and capital lease obligations 425,719 348,348
Delayed Draw Term Loan A Facility    
Debt and financing arrangements    
Long-term debt, gross 96,250  
Revolving credit facility    
Debt and financing arrangements    
Revolving credit facility 14,327 42,495
Term Loan    
Debt and financing arrangements    
Long-term debt, gross $ 356,250 $ 370,313