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FAIR VALUE ACCOUNTING (Details) - Recurring - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Assets:    
Investments $ 11,096 $ 8,543
Assets 11,096 8,543
Level 1    
Assets:    
Investments 8,233 6,749
Assets 8,233 6,749
Level 2    
Assets:    
Investments 2,863 1,794
Assets $ 2,863 $ 1,794