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RESTRICTED CASH AND SHORT-TERM INVESTMENTS (Details) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Restricted cash and short-term investment balances:    
Restricted cash and cash equivalents $ 26,543,000 $ 1,551,000
Restricted cash, current portion 23,432,000 1,551,000
Restricted cash 3,111,000 0
Amount of restricted cash excluded due to financial covenants $ 25,000,000