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ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME (Reclassification out of AOCI) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Other income (expense) $ 3,388us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
Unrealized holding gains on available-for-sale investments  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Other income (expense) $ 3,388us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember