Derivatives (Details - Income Statement) (Derivates not designated as hedges [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	$ 6,004	$ 7,366	$ (91,065)
Included in net foreign exchange gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	(64,183)	27,263	88,162
Included in net realized and unrealized investment gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	70,187	(19,897)	(179,227)
Foreign exchange forward contracts [Member] | Included in net foreign exchange gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	(59,019)	23,474	98,089
Foreign currency option contracts [Member] | Included in net foreign exchange gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	(5,164)	3,789	(9,927)
Futures contracts [Member] | Included in net realized and unrealized investment gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	78,841	(31,757)	(185,816)
Credit default swaps (protection purchased) [Member] | Included in net realized and unrealized investment gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	(134)	(907)	(352)
Credit default swaps (assumed risks) [Member] | Included in net realized and unrealized investment gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	123	2,016	886
Insurance-linked securities [Member] | Included in net realized and unrealized investment gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	(707)	4,343	(9,584)
Total return swaps [Member] | Included in net realized and unrealized investment gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	(6,597)	(749)	2,473
Interest rate swaps [Member] | Included in net realized and unrealized investment gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	7,469	112	(2,200)
TBAs [Member] | Included in net realized and unrealized investment gains and losses [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivatives recognized in income	$ (8,808)	$ 7,045	$ 15,366