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FAIR VALUE MEASUREMENT (Details) (Fair value measured on recurring basis, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Level 1
Financial assets:
Available-for-sale securities	$ 66,211	$ 74,581
Total financial assets	66,211	74,581
Financial liabilities:
Fair value of derivative financial instruments	33,385
Level 2
Financial assets:
Trade receivables	57,800	67,300
Available-for-sale securities	5,327
Fair value of derivative financial instruments	14,710	5,590
Total financial assets	77,837	72,890
Financial liabilities:
Fair value of derivative financial instruments	1,333	467
Total
Financial assets:
Trade receivables	57,800	67,300
Available-for-sale securities	71,538	74,581
Fair value of derivative financial instruments	14,710	5,590
Total financial assets	144,048	147,471
Financial liabilities:
Fair value of derivative financial instruments	$ 34,718	$ 467

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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