OTHER COMPREHENSIVE INCOME (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Before Tax Amount
Other Comprehensive Income (Loss), before Tax	$ 126,000	$ 221,019
Tax Expense
Other Comprehensive Income (Loss), Tax	(3,460)	(14,908)
Net of Tax Amount
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income	24,968	59,281
Other Comprehensive Income (Loss), Net of Tax	122,540	206,111
Unrealized gains (losses) on available for sale investments, net of tax [Member]
Before Tax Amount
Unrealized investment gains arising during the period	70,372	148,831
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	25,759	63,992
Other Comprehensive Income (Loss), before Tax	96,131	212,823
Tax Expense
Unrealized investment gains arising during the period	(2,669)	(10,197)
Adjustment for reclassification of net realized investment losses and OTTI losses recognized in net income	(791)	(4,711)
Other Comprehensive Income (Loss), Tax	(3,460)	(14,908)
Net of Tax Amount
Unrealized investment gains arising during the period	67,703	138,634
Adjustment for reclassification of net realized investment gains and OTTI losses recognized in net income	24,968	59,281
Other Comprehensive Income (Loss), Net of Tax	92,671	197,915
Accumulated Other-than-Temporary Impairment, net of tax [Member]
Before Tax Amount
Other Comprehensive Income (Loss), before Tax	0	0
Tax Expense
Other Comprehensive Income (Loss), Tax	0	0
Net of Tax Amount
Other Comprehensive Income (Loss), Net of Tax	0	0
Cumulative foreign currency translation adjustments, net of tax [Member]
Before Tax Amount
Other Comprehensive Income (Loss), before Tax	29,869	8,196
Tax Expense
Other Comprehensive Income (Loss), Tax	0	0
Net of Tax Amount
Other Comprehensive Income (Loss), Net of Tax	$ 29,869	$ 8,196