ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Changes in AOCI by Component
Other comprehensive income		$ 316		$ 311
Net Unrealized Gain (Loss) on Investments
Changes in AOCI by Component
Balance at the beginning of the period	$ 0	(26)	$ 0	(21)
OCI before reclassifications		316		(2,385)
Amounts reclassified from AOCI				2,696
Other comprehensive income	0	316	0	311
Balance at the end of the period	$ 0	$ 290	$ 0	$ 290