Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net income	$ 188,945	$ 201,818	$ 527,533	$ 573,729
Unrealized gains (losses) on securities:
Unrealized gains (losses)	393,387	639,378	884,757	2,052,553
Less applicable tax (expense) benefit	(82,612)	(134,272)	(185,800)	(431,037)
Unrealized gains (losses) on investments, net of tax	310,775	505,106	698,957	1,621,516
Deferred acquisition costs:
Unrealized gains (losses) attributable to deferred acquisition costs	385	402	1,150	(2,627)
Less applicable tax (expense) benefit	(81)	(84)	(242)	552
Unrealized gains (losses) attributable to deferred acquisition costs, net of tax	304	318	908	(2,075)
Foreign exchange translation:
Foreign exchange translation adjustments, other than securities	5,522	(4,082)	(4,973)	(1,031)
Less applicable tax (expense) benefit	(1,158)	858	1,045	218
Foreign exchange translation adjustments, other than securities, net of tax	4,364	(3,224)	(3,928)	(813)
Pension:
Amortization of pension costs	4,156	2,117	12,471	6,355
Less applicable tax (expense) benefit	(873)	(443)	(2,619)	(1,334)
Pension adjustments, net of tax	3,283	1,674	9,852	5,021
Other comprehensive income (loss)	318,726	503,874	705,789	1,623,649
Comprehensive income (loss)	507,671	705,692	1,233,322	2,197,378
Securities
Unrealized gains (losses) on securities:
Unrealized holding gains (losses) arising during period	380,299	649,270	861,871	2,057,614
Other reclassification adjustments included in net income	11,838	(11,020)	37,060	(14,307)
Foreign exchange adjustment on securities recorded at fair value	1,250	(301)	(914)	183
Unrealized gains (losses)	393,387	637,949	898,017	2,043,490
Other investments
Unrealized gains (losses) on securities:
Unrealized gains (losses)	$ 0	$ 1,429	$ (13,260)	$ 9,063