Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income	$ 744,959	$ 731,773	$ 760,790
Unrealized gains (losses) on fixed maturities:
Unrealized gains (losses)	(519,345)	1,510,033	1,958,165
Less applicable tax (expense) benefit	109,063	(317,111)	(411,213)
Unrealized gains (losses) on investments, net of tax	(410,282)	1,192,922	1,546,952
Deferred acquisition costs:
Unrealized gains (losses) attributable to deferred acquisition costs	1,628	1,533	(2,218)
Less applicable tax (expense) benefit	(342)	(321)	465
Unrealized gains (losses) attributable to deferred acquisition costs, net of tax	1,286	1,212	(1,753)
Foreign exchange translation:
Foreign exchange translation adjustments, other than securities	(4,955)	14,230	7,042
Less applicable tax (expense) benefit	1,040	(2,986)	(1,479)
Foreign exchange translation adjustments, other than securities, net of tax	(3,915)	11,244	5,563
Pension:
Amortization of pension costs	20,797	16,632	8,474
Plan amendments	4,565	0	0
Experience gain (loss)	61,299	(43,169)	(40,636)
Pension adjustments	77,531	(26,537)	(32,162)
Less applicable tax (expense) benefit	(16,281)	5,573	6,755
Pension adjustments, net of tax	61,250	(20,964)	(25,407)
Other comprehensive income (loss)	(351,661)	1,184,414	1,525,355
Comprehensive income (loss)	393,298	1,916,187	2,286,145
Securities
Unrealized gains (losses) on fixed maturities:
Unrealized holding gains (losses) arising during period	(492,267)	1,493,200	1,959,596
Other reclassification adjustments included in net income	(31,710)	32,809	(13,837)
Foreign exchange adjustment on fixed maturities recorded at fair value	4,632	2,330	1,151
Unrealized gains (losses)	(519,345)	1,528,339	1,946,910
Other investments
Unrealized gains (losses) on fixed maturities:
Unrealized gains (losses)	$ 0	$ (18,306)	$ 11,255