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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) - Fair Value, Measurements, Recurring - Fair Value Measurements (Level 3)
$ in Thousands
3 Months Ended
Mar. 31, 2015
USD ($)
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 $ (3,392)
Total gains (losses) for the period:  
Included in earnings (20)
Ending balance (3,412)
Change in unrealized losses included in earnings relating to assets and liabilities held for the period (20)
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 6,528
Total gains (losses) for the period:  
Included in earnings 960
Included in other comprehensive income 922
Sales and settlements:  
Sales (7,219)
Settlements (98)
Transfers in and/or out of Level 3 (1,093)
Ending balance 0
Change in unrealized losses included in earnings relating to assets and liabilities held for the period $ 0