FAIR VALUE ACCOUNTING (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair value [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash flow hedging derivatives - Assets	$ 75,795	$ 39,175
Cash flow hedging derivatives - Liabilities	56,252	53,407
Quoted Prices in Active Markets of Identical Assets (Level 1)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash flow hedging derivatives - Assets	58,093	37,056
Cash flow hedging derivatives - Liabilities	55,931	39,066
Significant Other Observable Inputs (Level 2)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash flow hedging derivatives - Assets	17,702	2,119
Cash flow hedging derivatives - Liabilities	321	14,341
Significant Unobservable Inputs (Level 3)
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash flow hedging derivatives - Assets	0	0
Cash flow hedging derivatives - Liabilities	$ 0	$ 0