New Accounting Pronouncements - Effect of Transition Adjustments on Stockholders' Equity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefits	$ 908,212			$ 998,603
Policyholder Account Balances	7,285,129		$ 7,661,785	7,964,609		$ 8,220,944		$ 8,378,037
Additional Liability for Benefits	151,787			118,645		115,151		119,374
DPAC Balances	(644,933)		(663,882)	(699,432)		(704,353)		(695,875)
DSI Balances	(78,209)		(85,303)	(102,453)		(102,976)		(96,378)
Market Risk Benefits Liability						299,833		$ 301,601
Total stockholders’ equity	2,278,200		2,190,922	2,263,175	$ 2,459,448	2,721,553
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity	2,669,327	$ 2,639,693	2,627,389	2,576,241	2,479,714	2,382,152
Accumulated Other Comprehensive Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total stockholders’ equity	$ (432,879)		$ (478,219)	$ (354,818)	$ (62,018)	$ 297,649
Effect Of Application Of Accounting Standards Update 2018-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefits							$ (122,384)
Policyholder Account Balances							303,503
Additional Liability for Benefits							(85,463)
DPAC Balances							247,897
DSI Balances							41,501
Market Risk Benefits Liability							(180,080)
Total stockholders’ equity							204,974
Effect Of Application Of Accounting Standards Update 2018-12 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefits							(9,650)
Policyholder Account Balances							303,503
Additional Liability for Benefits							(85,463)
DPAC Balances							0
DSI Balances							0
Market Risk Benefits Liability							(180,080)
Total stockholders’ equity							28,310
Effect Of Application Of Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Liability for future policy benefits							(112,734)
Policyholder Account Balances							0
Additional Liability for Benefits							0
DPAC Balances							247,897
DSI Balances							41,501
Market Risk Benefits Liability							0
Total stockholders’ equity							$ 176,664