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Investments (Available-For-Sale Securities Disclosure) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	$ 7,185,754	$ 6,490,753
Fixed income securities, available-for-sale, allowance for credit loss	45,721	9,724	$ 3,969
Unrealized gains	9,262	246,301
Unrealized losses	537,188	17,354
Debt Securities, Available-for-sale, Fair Value	6,612,107	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	209,528	127,974
Fixed income securities, available-for-sale, allowance for credit loss	0	0
Unrealized gains	37	3,629
Unrealized losses	20,326	1,145
Debt Securities, Available-for-sale, Fair Value	189,239	130,458
Foreign Government [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	11,199	15,420
Fixed income securities, available-for-sale, allowance for credit loss	284	46	1
Unrealized gains	0	609
Unrealized losses	1,307	123
Debt Securities, Available-for-sale, Fair Value	9,608	15,860
Obligations of States and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	965,231	1,121,422
Fixed income securities, available-for-sale, allowance for credit loss	1,024	137	4
Unrealized gains	1,812	68,258
Unrealized losses	48,001	235
Debt Securities, Available-for-sale, Fair Value	918,018	1,189,308
Corporate Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	2,558,655	2,478,348
Fixed income securities, available-for-sale, allowance for credit loss	30,330	6,682	2,782
Unrealized gains	3,509	106,890
Unrealized losses	196,809	4,953
Debt Securities, Available-for-sale, Fair Value	2,335,025	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	1,607,660	1,343,687
Fixed income securities, available-for-sale, allowance for credit loss	2,375	939	592
Unrealized gains	2,408	14,350
Unrealized losses	121,720	6,284
Debt Securities, Available-for-sale, Fair Value	1,485,973	1,350,814
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	1,169,546	756,280
Fixed income securities, available-for-sale, allowance for credit loss	11,597	1,909	561
Unrealized gains	1,148	24,813
Unrealized losses	99,265	2,932
Debt Securities, Available-for-sale, Fair Value	1,059,832	776,252
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Fixed income securities, available-for-sale, amortized cost	663,935	647,622
Fixed income securities, available-for-sale, allowance for credit loss	111	11	$ 29
Unrealized gains	348	27,752
Unrealized losses	49,760	1,682
Debt Securities, Available-for-sale, Fair Value	$ 614,412	$ 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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