ACCUMULATED OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 3,122,950	$ 2,856,111
Other comprehensive (loss) income	$ (5,462)	$ (3,600)	7,767	(2,407)
Ending balance	3,378,054	3,071,115	3,378,054	3,071,115
Available-for-Sale Investment Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	11,756	5,430	(6,144)	4,237
Net unrealized (losses) gains arising during the period	(3,869)	13,127	17,901	20,096
Amounts reclassified from AOCI	(1,038)	(9,881)	(4,908)	(15,657)
Other comprehensive (loss) income	(4,907)	3,246	12,993	4,439
Ending balance	6,849	8,676	6,849	8,676
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(13,468)	0	(8,797)	0
Net unrealized (losses) gains arising during the period	(555)	(6,846)	(5,226)	(6,846)
Amounts reclassified from AOCI	0		0	0
Other comprehensive (loss) income	(555)	(6,846)	(5,226)	(6,846)
Ending balance	(14,023)	(6,846)	(14,023)	(6,846)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(1,712)	5,430	(14,941)	4,237
Net unrealized (losses) gains arising during the period	(4,424)	6,281	12,675	13,250
Amounts reclassified from AOCI	(1,038)	(9,881)	(4,908)	(15,657)
Other comprehensive (loss) income	(5,462)	(3,600)	7,767	(2,407)
Ending balance	$ (7,174)	$ 1,830	$ (7,174)	$ 1,830