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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended |
--- | --- | ---
Jun. 30, 2013 item | Jun. 30, 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 | $ 11,416 |  | $ 10,608
Derivative Instruments | 87,607 |  | 50,824
Total Assets | 99,023 |  | 61,432
Liabilities |  |  |
Deferred Compensation Plan | 30,385 |  | 23,893
Derivative instruments |  |  | 192
Total Liabilities | 30,385 |  | 24,085
Transfer of Assets from Level 1 to Level 2 | 0 | 0 |
Transfer of Liabilities from Level 1 to Level 2 | 0 | 0 |
Transfer of Assets from Level 2 to Level 1 | 0 | 0 |
Transfer of Liabilities from Level 2 to Level 1 | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets |  |  |
Deferred compensation plan | 11,416 |  | 10,608
Total Assets | 11,416 |  | 10,608
Liabilities |  |  |
Deferred Compensation Plan | 30,385 |  | 23,893
Total Liabilities | 30,385 |  | 23,893
Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Derivative Instruments | 3,729 |  | 9,473
Total Assets | 3,729 |  | 9,473
Significant Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Derivative Instruments | 83,878 |  | 41,351
Total Assets | 83,878 |  | 41,351
Liabilities |  |  |
Derivative instruments |  |  | 192
Total Liabilities |  |  | $ 192

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