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CASH AND CASH EQUIVALENTS (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
CASH AND CASH EQUIVALENTS    
Short-term investments $ 71,754,000us-gaap_CashAndCashEquivalentsAtCarryingValue $ 75,539,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Reserve requirement, included in cash and equivalents 2,900,000us-gaap_RestrictedCashAndCashEquivalents 17,200,000us-gaap_RestrictedCashAndCashEquivalents
Short-term investments pledged as collateral    
CASH AND CASH EQUIVALENTS    
Short-term investments $ 9,900,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ShortTermInvestmentsMember		 $ 1,800,000us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FinancialInstrumentsOwnedAndPledgedAsCollateralAxis
= us-gaap_ShortTermInvestmentsMember