ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 4,237	$ (30,459)	$ 4,669
Net unrealized gains (losses) arising during the period	4,215	40,911	(27,833)
Amounts reclassified from AOCI	(23,393)	(6,215)	(7,295)
Changes, net of taxes	(19,178)	34,696	(35,128)
Ending balance	(14,941)	4,237	(30,459)
Available- for-Sale Investment Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	4,237	(30,459)	4,669
Net unrealized gains (losses) arising during the period	13,012	40,911	(27,833)
Amounts reclassified from AOCI	(23,393)	(6,215)	(7,295)
Changes, net of taxes	(10,381)	34,696	(35,128)
Ending balance	(6,144)	4,237	$ (30,459)
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	0
Net unrealized gains (losses) arising during the period	(8,797)
Amounts reclassified from AOCI	0
Changes, net of taxes	(8,797)
Ending balance	$ (8,797)	$ 0