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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 item | Sep. 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 | $ 11,865 |  | $ 10,608
Derivative instruments | 65,539 |  | 50,824
Total assets | 77,404 |  | 61,432
Liabilities |  |  |
Deferred compensation plan | 31,800 |  | 23,893
Derivative instruments |  |  | 192
Total liabilities | 31,800 |  | 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 | 11,865 |  | 10,608
Total assets | 11,865 |  | 10,608
Liabilities |  |  |
Deferred compensation plan | 31,800 |  | 23,893
Total liabilities | 31,800 |  | 23,893
Significant Other Observable Inputs (Level 2) |  |  |
Assets |  |  |
Derivative instruments | 93 |  | 9,473
Total assets | 93 |  | 9,473
Significant Unobservable Inputs (Level 3) |  |  |
Assets |  |  |
Derivative instruments | 65,446 |  | 41,351
Total assets | 65,446 |  | 41,351
Liabilities |  |  |
Derivative instruments |  |  | 192
Total liabilities |  |  | $ 192

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