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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
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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

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