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Debt - Schedule of Outstanding Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Debt Instrument [Line Items]      
Total debt $ 152,758 $ 156,792 $ 175,467
Less: debt issuance costs (390) (444) (501)
Total debt, net of issuance costs 152,368 156,348 174,966
Less: current portion (8,660) (8,646) (22,765)
Long-term portion of debt 143,708 147,702 152,201
Capital lease obligations      
Debt Instrument [Line Items]      
Total debt 2,179 2,374 2,594
Revolving credit facility      
Debt Instrument [Line Items]      
Total debt 0 0 14,100
Term Loan      
Debt Instrument [Line Items]      
Total debt $ 150,579 $ 154,418 $ 158,773