FAIR VALUE MEASUREMENTS (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments for contractual obligations	$ 10,087	$ 9,840
Derivative Asset, Current	5,583us-gaap_DerivativeAssetsCurrent	1,068us-gaap_DerivativeAssetsCurrent
Other Assets, Fair Value Disclosure	250us-gaap_OtherAssetsFairValueDisclosure	250us-gaap_OtherAssetsFairValueDisclosure
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(30)us-gaap_DerivativeLiabilities	(43)us-gaap_DerivativeLiabilities
Assets, Fair Value Disclosure	15,890us-gaap_AssetsFairValueDisclosure	11,115us-gaap_AssetsFairValueDisclosure
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Preferred stock at beginning of period		250us-gaap_OtherAssetsFairValueDisclosure
Preferred stock at end of period	250us-gaap_OtherAssetsFairValueDisclosure	250us-gaap_OtherAssetsFairValueDisclosure
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments for contractual obligations	10,087	9,840
Derivative Asset, Current	0	0
Other Assets, Fair Value Disclosure	0	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	10,087	9,840
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Preferred stock at beginning of period		0
Preferred stock at end of period	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments for contractual obligations	0	0
Derivative Asset, Current	5,583	1,068
Other Assets, Fair Value Disclosure	0	0
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	(30)	(43)
Assets, Fair Value Disclosure	5,553	1,025
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Preferred stock at beginning of period		0
Preferred stock at end of period	0	0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments for contractual obligations	0	0
Derivative Asset, Current	0	0
Other Assets, Fair Value Disclosure	250
Derivative Financial Instruments, Liabilities, Fair Value Disclosure	0	0
Assets, Fair Value Disclosure	250	250
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Preferred stock at beginning of period	250
Gain (Loss) on Investments	0
Preferred stock at end of period	$ 250

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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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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 liabilities not subject to a master netting arrangement and not elected to be offset.

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- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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