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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	$ 7,107,011		$ 6,490,753
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss	(52,337)	$ (50,800)	(9,724)	$ (7,169)	$ (6,011)	$ (3,969)
Unrealized gains	3,967		246,301
Unrealized losses	(586,541)		(17,354)
Debt Securities, Available-for-sale, Fair Value	6,472,100		6,709,976
U.S. Government and Government Agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	168,340		127,974
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss	0		0
Unrealized gains	6		3,629
Unrealized losses	(20,115)		(1,145)
Debt Securities, Available-for-sale, Fair Value	148,231		130,458
Foreign Government [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	16,060		15,420
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss	(320)	(265)	(46)	(47)	(49)	(1)
Unrealized gains	0		609
Unrealized losses	(1,960)		(123)
Debt Securities, Available-for-sale, Fair Value	13,780		15,860
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	1,031,937		1,121,422
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss	(1,311)	(1,206)	(137)	(99)	(38)	(4)
Unrealized gains	141		68,258
Unrealized losses	(63,137)		(235)
Debt Securities, Available-for-sale, Fair Value	967,630		1,189,308
Corporate Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	2,535,367		2,478,348
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss	(36,970)	(35,072)	(6,682)	(4,719)	(3,477)	(2,782)
Unrealized gains	1,222		106,890
Unrealized losses	(234,983)		(4,953)
Debt Securities, Available-for-sale, Fair Value	2,264,636		2,573,603
Collateralized Loan Obligations and Other Asset Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	1,581,097		1,343,687
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss	(3,114)	(3,623)	(939)	(926)	(1,399)	(592)
Unrealized gains	1,732		14,350
Unrealized losses	(112,292)		(6,284)
Debt Securities, Available-for-sale, Fair Value	1,467,423		1,350,814
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	1,130,752		756,280
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss	(10,603)	(10,616)	(1,909)	(1,363)	(1,034)	(561)
Unrealized gains	764		24,813
Unrealized losses	(104,856)		(2,932)
Debt Securities, Available-for-sale, Fair Value	1,016,057		776,252
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	643,458		647,622
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss	(19)	$ (18)	(11)	$ (15)	$ (14)	$ (29)
Unrealized gains	102		27,752
Unrealized losses	(49,198)		(1,682)
Debt Securities, Available-for-sale, Fair Value	$ 594,343		$ 673,681

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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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