Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2016		Jun. 30, 2015		Jun. 30, 2016		Jun. 30, 2015
Net income	$ 138,429	[1]	$ 127,110	[2]	$ 262,462	[1]	$ 248,758	[2]
Unrealized gains (losses) on securities:
Total unrealized investment gains (losses)	692,615		(940,541)		1,157,208		(677,165)
Less applicable (taxes) benefits	(242,401)		328,996		(404,990)		236,865
Unrealized investment gains (losses), net of tax	450,214		(611,545)		752,218		(440,300)
Unrealized gains (losses) attributable to deferred acquisition costs	(2,681)		2,953		(5,450)		3,605
Less applicable (taxes) benefits	938		(1,034)		1,907		(1,262)
Unrealized gains (losses) attributable to deferred acquisition costs, net of tax	(1,743)		1,919		(3,543)		2,343
Foreign exchange translation adjustments, other than securities	5,382		(4,845)		7,142		(13,536)
Less applicable (taxes) benefits	(1,898)		1,774		(2,438)		4,503
Foreign exchange translation adjustments, other than securities, net of tax	3,484		(3,071)		4,704		(9,033)
Pension adjustments	2,656		3,653		5,894		7,472
Less applicable (taxes) benefits	(929)		(1,278)		(2,063)		(2,615)
Pension adjustments, net of tax	1,727		2,375		3,831		4,857
Other comprehensive income (loss)	453,682		(610,322)		757,210		(442,133)
Comprehensive income (loss)	592,111		(483,212)		1,019,672		(193,375)
Securities [Member]
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	695,984		(935,288)		1,161,141		(668,706)
Reclassification adjustment for (gains) losses on securities included in net income	(3,983)		(1,479)		(4,296)		(1,598)
Reclassification adjustment for amortization of (discount) and premium	(1,204)		(1,599)		(2,568)		(3,271)
Foreign exchange adjustment on securities recorded at fair value	593		1,295		1,048		(1,263)
Unrealized gains (losses) on securities	691,390		(937,071)		1,155,325		(674,838)
Other Investments [Member]
Unrealized gains (losses) on securities:
Unrealized gains (losses) on other investments	$ 1,225		$ (3,470)		$ 1,883		$ (2,327)

[1] Due to the adoption of ASU 2016-09, certain balances related to excess tax benefits from stock compensation were adjusted prospectively as described in Note 2—New Accounting Standards.

[2] Certain prior year balances were adjusted to give effect to discontinued operations as described in Note 5—Discontinued Operations.