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ACCOUNTING FOR DERIVATIVES (Details) (USD $)
 3 Months Ended
Mar. 31, 2012
country
Mar. 31, 2012
Designated as a hedging instrument
Interest rate hedges
Dec. 31, 2011
Designated as a hedging instrument
Interest rate hedges
Mar. 31, 2012
Designated as a hedging instrument
Interest rate hedges
Accrued liabilities
Dec. 31, 2011
Designated as a hedging instrument
Interest rate hedges
Accrued liabilities
Mar. 31, 2012
Designated as a hedging instrument
Interest rate hedges
Other long-term liabilities
Dec. 31, 2011
Designated as a hedging instrument
Interest rate hedges
Other long-term liabilities
Dec. 31, 2010
Terminated hedge
Interest rate hedges
Mar. 31, 2012
Terminated hedge
Interest rate hedges
ACCOUNTING FOR DERIVATIVES                  
Number of countries company operates 30                
Fair Value Asset (Liability)                  
Notional amount of interest rate swaps   $ 715,000,000           $ 585,000,000  
Notional amount of interest rate swaps which expire on or before August 2012   465,000,000              
Weighted average effective fixed interest rate on interest rate swaps (as a percent)   3.60%           4.60%  
Deferred pre-tax loss to be reclassified during next 12 months   10,400,000             7,300,000
Amount of interest rate swap termination payments               43,000,000  
Derivatives liability designated as hedging instruments, Fair value   $ (15,531,000) $ (19,446,000) $ (10,356,000) $ (14,250,000) $ (5,175,000) $ (5,196,000)