LONG TERM DEBT AND CAPITAL LEASES - Credit Facility (Details)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015
Line of Credit Facility [Line Items]
Debt redemption price	101.938%
Senior Subordinated Notes, Due February 2019; bore interest at 7.75%
Line of Credit Facility [Line Items]
Debt instrument interest rate	7.75%	7.75%
Senior Secured Asset-Backed Credit Facility, Due February 2020; bearing interest at one month LIBOR plus 2.25%
Line of Credit Facility [Line Items]
Additional revolver capacity	$ 100,000,000
Term Loan B Facility | Secured Debt
Line of Credit Facility [Line Items]
Principal amount	$ 350,000,000
Facility term	7 years
Net leverage ratio	3.75
Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00%
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.00%
Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility maximum	$ 160,000,000
Facility term	5 years
Remaining capacity	$ 72,072,000
Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% | Line of Credit | Letter of Credit
Line of Credit Facility [Line Items]
Outstanding irrevocable letters of credit totaling	$ 25,328,000
Minimum | Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument interest rate	2.50%
Maximum | Revolving Credit Facility due October 2021; bearing interest at LIBOR plus 3.00% | Line of Credit | Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt instrument interest rate	3.25%
LIBOR | Term Loan B Facility | Secured Debt
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.75%
LIBOR | Minimum | Term Loan B Facility | Secured Debt
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
LIBOR | Maximum | Term Loan B Facility | Secured Debt
Line of Credit Facility [Line Items]
Basis spread on variable rate	3.00%