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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
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
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) $ (3,655)
Total gains (losses) for the period:    
Included in earnings (20) 263
Sales and settlements:    
Settlements 3,412 0
Ending balance 0 (3,392)
Changes in unrealized gains included in earnings relating to assets and liabilities held for the period 0 263
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 6,371
Total gains (losses) for the period:    
Included in earnings 960 802
Included in other comprehensive income 922 2,326
Sales and settlements:    
Sales (7,219) (2,595)
Settlements (98) (376)
Transfers out of Level 3 (1,093)  
Ending balance 0 6,528
Changes in unrealized gains included in earnings relating to assets and liabilities held for the period 0 $ 0
Sales and settlements:    
Transfers out of Level 3 $ (1,093)