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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) - Fair Value, Measurements, Recurring - Fair Value Measurements (Level 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Embedded derivative liabilities    
Reconciliation of the beginning and ending balances for major liability categories measured at fair value on a recurring basis using significant unobservable inputs (Level 3)    
Beginning balance $ (3,412) $ (3,392)
Total gains (losses) for the period:    
Included in earnings 0 (20)
Sales and settlements:    
Settlements 3,412 3,412
Ending balance 0 0
Change in unrealized losses included in earnings relating to assets and liabilities held for the period 0 0
Corporate debt securities | Non-investment grade    
Reconciliation of the beginning and ending balances for major asset categories measured at fair value on a recurring basis using significant unobservable inputs (Level 3)    
Beginning balance 0 6,528
Total gains (losses) for the period:    
Included in earnings 0 960
Included in other comprehensive income 0 922
Sales and settlements:    
Sales 0 (7,219)
Settlements 0 (98)
Transfers in and/or out of Level 3 0 (1,093)
Ending balance 0 0
Change in unrealized losses included in earnings relating to assets and liabilities held for the period $ 0 $ 0