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DEBT - Outstanding debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt    
Short-term debt, borrowings on revolving line of credit $ 125,000 $ 176,300
Long-term debt 458,750 464,500
Unamortized debt issuance costs (13,245) (14,631)
Total long-term debt 445,505 449,869
Less: current portion 11,500 11,500
Long-term debt, less current portion 434,005 438,369
Term Loan A    
Debt    
Long-term debt 138,750 142,500
Term Loan B    
Debt    
Long-term debt 320,000 322,000
Revolving line of credit    
Debt    
Short-term debt, borrowings on revolving line of credit $ 125,000 $ 176,300