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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 item | Mar. 31, 2012 item | Dec. 31, 2012
Financial Assets and Liabilities Fair Value Measurement |  |  |
Number of non-financial assets and liabilities impaired | 0 | 0 |
Assets |  |  |
Deferred compensation plan | $ 11,372 |  | $ 10,608
Derivative Instruments | 4,215 |  | 50,824
Total Assets | 15,587 |  | 61,432
Liabilities |  |  |
Deferred Compensation Plan | 29,429 |  | 23,893
Derivative instruments | 29,899 |  | 192
Total Liabilities | 59,328 |  | 24,085
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets |  |  |
Deferred compensation plan | 11,372 |  | 10,608
Total Assets | 11,372 |  | 10,608
Liabilities |  |  |
Deferred Compensation Plan | 29,429 |  | 23,893
Total Liabilities | 29,429 |  | 23,893
Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Derivative Instruments | 4,215 |  | 9,473
Total Assets | 4,215 |  | 9,473
Significant Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Derivative Instruments |  |  | 41,351
Total Assets |  |  | 41,351
Liabilities |  |  |
Derivative instruments | 29,899 |  | 192
Total Liabilities | $ 29,899 |  | $ 192

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