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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Carrying Amount
   
Summary of the fair value and carrying value of debt    
Total debt $ 1,803,906 $ 1,773,039
Carrying Amount | Fixed rate debt
   
Summary of the fair value and carrying value of debt    
Total debt 803,906 794,039
Carrying Amount | Floating rate debt
   
Summary of the fair value and carrying value of debt    
Total debt 1,000,000 979,000
Fair Value
   
Summary of the fair value and carrying value of debt    
Total debt 1,824,000 1,781,000
Fair Value | Fixed rate debt
   
Summary of the fair value and carrying value of debt    
Total debt 821,000 792,000
Fair Value | Floating rate debt
   
Summary of the fair value and carrying value of debt    
Total debt $ 1,003,000 $ 989,000