FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 2) - Fair Value, Measurements, Recurring - Significant Unobservable Inputs (Level 3) - Corporate debt securities - Non-investment grade - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reconciliation of assets measured at fair value on a recurring basis using significant unobservable inputs
Beginning balance	$ 7,917	$ 6,528	$ 6,371
Total gains (losses) for the period:
Included in earnings		960
Included in other comprehensive income	1,009	922	2,652
Purchases, issues, sales, settlements:
Sales		(7,219)
Settlements	(17)	(98)	(114)
Transfers in and/or out of Level 3		(1,093)
Ending balance	$ 8,909	$ 0	$ 8,909