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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Carrying Amount |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 1,709,451 | $ 1,773,039
Carrying Amount | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 798,951 | 794,039
Carrying Amount | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 910,500 | 979,000
Fair Value |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,739,000 | 1,781,000
Fair Value | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 825,000 | 792,000
Fair Value | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 914,000 | $ 989,000

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