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DERIVATIVE CONTRACTS AND COLLATERALIZED INDEBTEDNESS, Location of Assets and Liabilities with the Consolidated Balance Sheets (Details) (Derivatives Not Designated as Hedging Instruments [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivative Instruments, Fair Value [Abstract]
Asset derivatives	$ 18,252	$ 3,143
Liability derivatives	119,462	148,263
Prepaid Forward Contracts [Member] \| Derivative Contracts, Current [Member]
Derivative Instruments, Fair Value [Abstract]
Asset derivatives	0	0
Liability derivatives	114,617	134,524
Prepaid Forward Contracts [Member] \| Derivative Contracts, Long-Term [Member]
Derivative Instruments, Fair Value [Abstract]
Asset derivatives	18,252	3,143
Liability derivatives	$ 4,845	$ 13,739

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details