Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Consolidated statements of operations:
Current income taxes	$ 332	$ 3,430	$ 12,528
Deferred income taxes	128,423	141,071	56,947
Total income tax expense included in consolidated statements of operations	128,755	144,501	69,475
Stockholders' equity:
Expense (benefit) relating to: Adoption of expected credit loss model	0	(2,543)	0
Expense (benefit) relating to: Change in net unrealized investment losses	(90,284)	225,746	372,472
Total income tax expense included in consolidated financial statements	$ 38,471	$ 367,704	$ 441,947