LONG-TERM DEBT LIABILITIES - Debt Extinguishment and Net Interest Expense (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Net Interest Expense
Interest expense	$ 8,490	$ 8,743
Amortization of deferred financing costs	707	1,087
Amortization of original issue discount of senior notes	82	73
Interest expense on interest rate hedging agreements	0	0
Interest income and other investment income	0	0
Total net interest expense	$ 9,279	$ 9,903