LONG-TERM DEBT LIABILITIES - Senior Debt (Details) (USD $)	9 Months Ended
	Sep. 30, 2012 number	Sep. 30, 2011
Debt Instrument [Line Items]
Credit Facility	$ 425,000,000
Consolidated Leverage Ratio	5.1
Consolidated Interest Coverage Ratio	2.5
Amortization of deferred financing costs (including original issue discount)	3,465,000	2,825,000
Deferred Finance Costs, Current, Net	6,100,000
Minimum [Member]
Debt Instrument [Line Items]
Consolidated Interest Coverage Ratio	1.5
Mandatory Prepayment Percentage	0.00%
Maximum [Member]
Debt Instrument [Line Items]
Consolidated Leverage Ratio	7.0
Mandatory Prepayment Percentage	50.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Credit Facility	50,000,000
Undrawn amount of the Revolver	33,400,000
Line of Credit Facility, Amount Outstanding	16,000,000
Term Loan B
Debt Instrument [Line Items]
Credit Facility	375,000,000
Mandatory prepayments amount	11,000,000
Line of Credit Facility, Amount Outstanding	$ 353,500,000