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FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
FAIR VALUE MEASUREMENTS    
Restricted cash and cash equivalents $ 26,017 $ 29,414
Carrying Amount
   
FAIR VALUE MEASUREMENTS    
Cash and cash equivalents 91,667 80,190
Restricted cash and cash equivalents 26,017 29,414
Accrued expenses (23,265) (19,960)
Fair Value
   
FAIR VALUE MEASUREMENTS    
Cash and cash equivalents 91,667 80,190
Restricted cash and cash equivalents 26,017 29,414
Accrued expenses (23,265) (19,960)
Cash in escrow for surety bonds
   
FAIR VALUE MEASUREMENTS    
Restricted cash and cash equivalents $ 2,453 $ 6,500