Schedule II - Condensed Financial Information of Registrant - Condensed Statements of Financial Position (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 714,624	$ 581,059
Other assets	126,609	135,310
Total assets	14,330,189	14,648,270	$ 12,553,447
Liabilities:
Current Federal income tax liability	2,331	0
Other liabilities	154,409	193,904
Total liabilities	11,790,498	12,108,520
Stockholders' Equity:
Additional paid-in capital	41,716	41,716
Accumulated other comprehensive income	215,953	395,421
Increase (decrease) to retained earnings	2,281,986	2,102,577
Total stockholders' equity	2,539,691	2,539,750	$ 2,116,430
Total liabilities and stockholders' equity	14,330,189	14,648,270
The Company
ASSETS
Investment in subsidiaries	2,538,996	2,535,669
Cash and cash equivalents	7,017	8,376
Deferred Federal income tax asset	8,258	7,721
Other assets	263	293
Total assets	2,554,534	2,552,059
Liabilities:
Current Federal income tax liability	14,388	11,667
Other liabilities	455	642
Total liabilities	14,843	12,309
Stockholders' Equity:
Additional paid-in capital	41,716	41,716
Accumulated other comprehensive income	215,953	395,421
Increase (decrease) to retained earnings	2,281,986	2,102,577
Total stockholders' equity	2,539,691	2,539,750
Total liabilities and stockholders' equity	2,554,534	2,552,059
Class A
Stockholders' Equity:
Common stock, value outstanding	34	34
Class A | The Company
Stockholders' Equity:
Common stock, value outstanding	34	34
Class B
Stockholders' Equity:
Common stock, value outstanding	2	2
Class B | The Company
Stockholders' Equity:
Common stock, value outstanding	$ 2	$ 2