LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Interest Expense
Interest expense		$ 33,799	$ 34,764	$ 34,656
Amortization of deferred financing costs		2,585	2,863	3,860
Amortization of original issue discount of senior notes		312	340	305
Interest income and other investment income		(57)	(6)	0
Total net interest expense		36,639	37,961	38,821
Extinguishment of Debt [Line Items]
Write-off of unamortized deferred financing costs	$ 3,500
Gains (Losses) on Extinguishment of Debt		(10,858)	$ 0	$ 0
Senior Notes due December, 1, 2019 [Member]
Extinguishment of Debt [Line Items]
Gains (Losses) on Extinguishment of Debt		10,100
New Credit Facility [Member] | New Revolver [Member]
Extinguishment of Debt [Line Items]
Deferred Financing Costs - 2016 Refinancing		1,100
New Credit Facility [Member] | New Term B Loan [Member]
Extinguishment of Debt [Line Items]
Deferred Financing Costs - 2016 Refinancing		6,900
Former Facility [Member] | Revolving Credit Facility [Member]
Extinguishment of Debt [Line Items]
Write-off of unamortized deferred financing costs		100
Former Facility [Member] | Modified Term B Loan [Member]
Extinguishment of Debt [Line Items]
Unamortized Costs Deferred		1,000
Lender and Third Party Fees Expensed - 2016 Refinancing		600
Former Facility [Member] | Extinguished Term B Loan [Member]
Extinguishment of Debt [Line Items]
Write-off of unamortized deferred financing costs		500
Lender and Third Party Fees Expensed - 2016 Refinancing		$ 200