Deferred Policy Acquisition Costs (Balance of and Changes in DAC) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Balance, beginning of year	$ 2,433,936	$ 1,855,698	$ 1,613,922
Capitalization of commissions, sales and issue expenses	1,057,030	758,469	451,773
Amortization-Impact of assumption and experience unlocking and true-ups	40,482	(27,844)	(34,619)
Amortization-All other	(382,600)	(112,718)	(78,699)
Change due to unrealized investment gains and losses	(81,031)	(39,861)	(37,337)
Other	3,763,155	192	(59,342)
Balance, end of year	$ 6,830,972	$ 2,433,936	$ 1,855,698