DERIVATIVES AND HEDGING ACTIVITIES (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts outstanding	$ 100,000,000	$ 475,000,000	$ 100,000,000	$ 475,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance			(7,277,000)	(13,432,000)	(13,432,000)
Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax	1,039,000	1,424,000	9,174,000	3,159,000	6,155,000
Ending balance	1,897,000		1,897,000		(7,277,000)
Swap Expiring September 2011 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	125,000,000		125,000,000
Effective date			Mar. 28, 2008
Derivative Fixed Libor Rate	2.91%		2.91%
Swap Expiring May 2012 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts outstanding	100,000,000		100,000,000
Effective date			May 28, 2008
Derivative Fixed Libor Rate	3.62%		3.62%
Swap Expiring January 2011 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	150,000,000		150,000,000
Effective date			Jan. 28, 2008
Derivative Fixed Libor Rate	3.03%		3.03%
Collar Expiring February 2011 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	100,000,000		100,000,000
Effective date			Feb. 28, 2008
Derivative, Cap Interest Rate	4.00%		4.00%
Derivative, Floor Interest Rate	2.14%		2.14%
Swap Expiring January 2010 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired		75,000,000		75,000,000
Effective date				Jan. 28, 2008
Derivative Fixed Libor Rate		3.03%		3.03%
Interest Expense [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) reclassified from OCI to statement of operations	0	0	0	0
Amount of gain (loss) in statement of operations due to ineffectiveness			0	0
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income ("OCI")	1,679,000	1,424,000	5,129,000	3,159,000
Current Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	2,148,000		2,148,000		2,958,000
Other Long Term Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 0		$ 0		$ 4,319,000