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FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets:    
Bonds available-for-sale $ 196,485 $ 969,394
Liabilities:    
Derivative liabilities 662 3,544
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
   
Assets:    
Bonds available-for-sale 0 0
Liabilities:    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
   
Assets:    
Bonds available-for-sale 0 0
Liabilities:    
Derivative liabilities 0 2,477
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
   
Assets:    
Bonds available-for-sale 196,485 969,394
Liabilities:    
Derivative liabilities $ 662 $ 1,067