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Investments (Available-For-Sale Fixed Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 3,742,234		$ 3,852,411
Allowance for Expected Credit Losses	560	$ 419	427	$ 553	$ 553	$ 0
Gross Unrealized Gains	1,248		1,827
Gross Unrealized Losses	387,610		381,339
Estimated Fair Value	3,355,312		3,472,472
U.S. Treasury obligations
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	261,067		243,999
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	0		8
Gross Unrealized Losses	23,239		22,399
Estimated Fair Value	237,828		221,608
U.S. Government-sponsored enterprise obligations
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	20,354		21,562
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	1,483		1,628
Estimated Fair Value	18,871		19,934
State and municipal bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	480,277		483,584
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	49		177
Gross Unrealized Losses	44,058		44,311
Estimated Fair Value	436,268		439,450
Corporate debt
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,864,148		1,980,579
Allowance for Expected Credit Losses	0		0	$ 553	$ 553	$ 0
Gross Unrealized Gains	598		735
Gross Unrealized Losses	200,768		199,862
Estimated Fair Value	1,663,978		1,781,452
Residential mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	470,066		450,870
Allowance for Expected Credit Losses	216	$ 223	229
Gross Unrealized Gains	333		555
Gross Unrealized Losses	73,236		61,656
Estimated Fair Value	396,947		389,540
Agency commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	9,768		10,576
Allowance for Expected Credit Losses	0		0
Gross Unrealized Gains	0		0
Gross Unrealized Losses	1,116		872
Estimated Fair Value	8,652		9,704
Other commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	210,104		217,021
Allowance for Expected Credit Losses	151		0
Gross Unrealized Gains	25		63
Gross Unrealized Losses	24,169		22,994
Estimated Fair Value	185,809		194,090
Other asset-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	426,450		444,220
Allowance for Expected Credit Losses	193		198
Gross Unrealized Gains	243		289
Gross Unrealized Losses	19,541		27,617
Estimated Fair Value	$ 406,959		$ 416,694

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