DERIVATIVES AND HEDGING ACTIVITIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts outstanding	$ 100,000,000	$ 475,000,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Beginning balance	(7,277,000)	(13,432,000)	(15,262,000)
Other Comprehensive Income, Derivatives Qualifying as Hedges, Net of Tax	7,277,000	6,155,000	1,830,000
Ending balance	0	(7,277,000)	(13,432,000)
Current Liabilities [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(1,346,000)	(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	(4,319,000)
Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in other comprehensive income ("OCI")	5,643,000	6,155,000	1,830,000
Interest Expense [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) reclassified from OCI to statement of operations	(1,634,000)	0	0
Amount of gain (loss) in statement of operations due to ineffectiveness	288,000	0	0
Swap Expiring September 2011 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	125,000,000
Effective date	Mar. 28, 2008
Derivative Fixed Libor Rate	2.91%
Swap Expiring May 2012 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts outstanding	100,000,000
Effective date	May 28, 2008
Derivative Fixed Libor Rate	3.62%
Swap Expiring January 2011 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	150,000,000
Effective date	Jan. 28, 2008
Derivative Fixed Libor Rate	3.03%
Collar Expiring February 2011 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired	100,000,000
Effective date	Feb. 28, 2008
Derivative, Cap Interest Rate	4.00%
Derivative, Floor Interest Rate	2.14%
Swap Expiring January 2010 [Member]
Derivative Instrument and Hedging Activities [Line Items]
Aggregate notional amounts expired		$ 75,000,000
Effective date		Jan. 28, 2008
Derivative Fixed Libor Rate		3.03%