9. FAIR VALUE MEASUREMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
First Lien Term Loan
FAIR VALUE MEASUREMENTS
Term loans face value	$ 444,845	$ 451,023
Second Lien Term Loans
FAIR VALUE MEASUREMENTS
Term loans face value	180,000	180,000
Level 1 | First Lien Term Loans
FAIR VALUE MEASUREMENTS
Long-Term Debt fair value	0	0
Level 1 | Second Lien Term Loans
FAIR VALUE MEASUREMENTS
Long-Term Debt fair value	0	0
Level 2 | First Lien Term Loans
FAIR VALUE MEASUREMENTS
Long-Term Debt fair value	433,724	444,258
Level 2 | Second Lien Term Loans
FAIR VALUE MEASUREMENTS
Long-Term Debt fair value	162,900	173,700
Level 3 | First Lien Term Loans
FAIR VALUE MEASUREMENTS
Long-Term Debt fair value	0	0
Level 3 | Second Lien Term Loans
FAIR VALUE MEASUREMENTS
Long-Term Debt fair value	0	0
Total Fair Value | First Lien Term Loans
FAIR VALUE MEASUREMENTS
Long-Term Debt fair value	433,724	444,258
Total Fair Value | Second Lien Term Loans
FAIR VALUE MEASUREMENTS
Long-Term Debt fair value	$ 162,900	$ 173,700