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Investments (Available-For-Sale Securities Disclosure) (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]
Fixed income securities, available-for-sale, amortized cost	$ 7,689,350		$ 7,185,754
Fixed income securities, available-for-sale, allowance for credit loss	(33,538)	$ (31,425)	(45,721)	$ (52,337)	$ (50,800)	$ (9,724)
Unrealized gains	6,772		9,262
Unrealized losses	(635,480)		(537,188)
Debt securities, available-for-sale, fair value	7,027,104		6,612,107
U.S. Government and Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	253,174		209,528
Fixed income securities, available-for-sale, allowance for credit loss	0		0
Unrealized gains	0		37
Unrealized losses	(26,445)		(20,326)
Debt securities, available-for-sale, fair value	226,729		189,239
Foreign Government [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	11,155		11,199
Fixed income securities, available-for-sale, allowance for credit loss	(32)	(34)	(284)	(320)	(265)	(46)
Unrealized gains	0		0
Unrealized losses	(1,807)		(1,307)
Debt securities, available-for-sale, fair value	9,316		9,608
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	672,075		965,231
Fixed income securities, available-for-sale, allowance for credit loss	(892)	(769)	(1,024)	(1,311)	(1,206)	(137)
Unrealized gains	125		1,812
Unrealized losses	(56,557)		(48,001)
Debt securities, available-for-sale, fair value	614,751		918,018
Corporate Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	2,684,453		2,558,655
Fixed income securities, available-for-sale, allowance for credit loss	(17,765)	(16,149)	(30,330)	(36,970)	(35,072)	(6,682)
Unrealized gains	2,003		3,509
Unrealized losses	(228,556)		(196,809)
Debt securities, available-for-sale, fair value	2,440,135		2,335,025
Collateralized Loan Obligations and Other Asset Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	1,819,454		1,607,660
Fixed income securities, available-for-sale, allowance for credit loss	(3,218)	(2,915)	(2,375)	(3,114)	(3,623)	(939)
Unrealized gains	4,144		2,408
Unrealized losses	(106,665)		(121,720)
Debt securities, available-for-sale, fair value	1,713,715		1,485,973
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	1,548,758		1,169,546
Fixed income securities, available-for-sale, allowance for credit loss	(11,625)	(11,550)	(11,597)	(10,603)	(10,616)	(1,909)
Unrealized gains	500		1,148
Unrealized losses	(153,174)		(99,265)
Debt securities, available-for-sale, fair value	1,384,459		1,059,832
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	700,281		663,935
Fixed income securities, available-for-sale, allowance for credit loss	(6)	$ (8)	(111)	$ (19)	$ (18)	$ (11)
Unrealized gains	0		348
Unrealized losses	(62,276)		(49,760)
Debt securities, available-for-sale, fair value	$ 637,999		$ 614,412

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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