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LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Nov. 30, 2017	Feb. 28, 2017
Long-term debt
Total	$ 567,378	$ 574,301
Less current portion	(48,022)	(43,056)
Less unamortized debt issuance costs			$ (4,800)	$ (14,200)
Long-term portion	567,378	569,740
Long-term debt
Long-term debt gross	632,231	635,007
Total	567,378	574,301
Term loan facility
Long-term debt
Total	495,970
Long-term debt
Total	495,970
Senior Debt
Long-term debt
Less current portion	(48,022)	(43,056)
Less unamortized debt issuance costs	(16,831)	(17,650)
Senior Debt \| Revolving credit facility
Long-term debt
Long-term debt gross		4,561
Senior Debt \| Term loan facility
Long-term debt
Long-term debt gross	495,970	498,462
Equipment term loans
Long-term debt
Total	129,786
Long-term debt
Long-term debt gross	129,786	126,227
Total	129,786
Real estate term loan
Long-term debt
Less unamortized debt issuance costs	(400)
Capital leases
Long-term debt
Long-term debt gross	$ 6,475	$ 5,757