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ACCUMULATED OTHER COMPREHENSIVE LOSS (Amount Reclassified Out of Accumulated Other Comprehensive Loss) (Details) (Unrealized gains on available-for-sale investments, USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Unrealized gains on available-for-sale investments
    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other income $ 0us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember		 $ (3,308)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember