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FAIR VALUE MEASUREMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Carrying Amount
Fair value disclosures
Long-Term Debt	$ 972,000	$ 950,000
Estimated Fair Value
Fair value disclosures
Long-Term Debt	$ 1,115,085	$ 1,082,531

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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