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FAIR VALUE - Cumulative other-than-temporary credit losses (Details 3) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Estimated credit losses, beginning of year $ 3,262 $ 3,262
Credit losses - no previous OTTI recognized    
Credit losses - previous OTTI recognized    
Estimated credit losses, end of period $ 3,262 $ 3,262