LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 972,372	$ 984,247
Less: current portion of long-term debt	3,500	3,500
Less: original issue discount and issuance costs	12,851	13,581
Long-term debt, net	956,021	967,166
2017 Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	346,500	347,375
9.25% Senior Subordinated Notes due February 2020 [Member]
Debt Instrument [Line Items]
Total debt	264,000	275,000
7.375% Senior Secured Notes due April 2022 [Member]
Debt Instrument [Line Items]
Total debt	350,000	350,000
Comcast Note due April 2019 [Member]
Debt Instrument [Line Items]
Total debt	$ 11,872	$ 11,872