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Fair Value Measurements (Schedule of Available-for-Sale Securities Reconciliation and Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value and Investments Classified by Contractual Maturity Date ) (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 312,422	$ 248,947
Unrealized Gains	2,963	1,050
Unrealized Losses	(1,618)	(3,246)
Fair Value	313,767	246,751
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	30,770	53,530
Less than 12 Months, Unrealized Losses	(296)	(364)
12 Months or Greater, Fair Value	32,751	84,579
12 Months or Greater, Unrealized Losses	(1,322)	(2,882)
Total, Fair Value	63,521	138,109
Total, Unrealized Losses	(1,618)	(3,246)
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Amortized Cost, Due within one year	62,604
Fair Value, Due within one year	62,446
Amortized Cost, Due after one year through five years	238,129
Fair Value, Due after one year through five years	240,124
Amortized Cost, Due after five years	11,689
Fair Value, Due after five years	11,197
Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	172,887	142,103
Unrealized Gains	1,951	638
Unrealized Losses	(1,403)	(2,755)
Fair Value	173,435	139,986
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	18,431	29,060
Less than 12 Months, Unrealized Losses	(81)	(215)
12 Months or Greater, Fair Value	32,751	46,824
12 Months or Greater, Unrealized Losses	(1,322)	(2,540)
Total, Fair Value	51,182	75,884
Total, Unrealized Losses	(1,403)	(2,755)
Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	139,535	106,844
Unrealized Gains	1,012	412
Unrealized Losses	(215)	(491)
Fair Value	140,332	106,765
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	12,339	24,470
Less than 12 Months, Unrealized Losses	(215)	(149)
12 Months or Greater, Fair Value	0	37,755
12 Months or Greater, Unrealized Losses	0	(342)
Total, Fair Value	12,339	62,225
Total, Unrealized Losses	(215)	(491)
Corporate debt securities | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	153,219	118,421
Unrealized Gains	1,909	603
Unrealized Losses	(450)	(1,242)
Fair Value	154,678	117,782
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	17,881	23,985
Less than 12 Months, Unrealized Losses	(76)	(159)
12 Months or Greater, Fair Value	22,344	30,384
12 Months or Greater, Unrealized Losses	(374)	(1,083)
Total, Fair Value	40,225	54,369
Total, Unrealized Losses	(450)	(1,242)
Corporate debt securities | Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	131,638	106,014
Unrealized Gains	817	224
Unrealized Losses	(32)	(491)
Fair Value	132,423	105,747
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	5,459	24,470
Less than 12 Months, Unrealized Losses	(32)	(149)
12 Months or Greater, Fair Value	0	37,755
12 Months or Greater, Unrealized Losses	0	(342)
Total, Fair Value	5,459	62,225
Total, Unrealized Losses	(32)	(491)
U.S. government agency securities | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	12,038	16,323
Unrealized Gains	18	35
Unrealized Losses	(356)	(663)
Fair Value	11,700	15,695
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	289	4,371
Less than 12 Months, Unrealized Losses	(1)	(43)
12 Months or Greater, Fair Value	5,236	10,699
12 Months or Greater, Unrealized Losses	(355)	(620)
Total, Fair Value	5,525	15,070
Total, Unrealized Losses	(356)	(663)
Municipal bonds | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	7,432	7,159
Unrealized Gains	24	0
Unrealized Losses	(583)	(831)
Fair Value	6,873	6,328
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	261	704
Less than 12 Months, Unrealized Losses	(4)	(13)
12 Months or Greater, Fair Value	4,986	5,560
12 Months or Greater, Unrealized Losses	(579)	(818)
Total, Fair Value	5,247	6,264
Total, Unrealized Losses	(583)	(831)
Municipal bonds | Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	7,897	830
Unrealized Gains	195	188
Unrealized Losses	(183)	0
Fair Value	7,909	1,018
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	6,880
Less than 12 Months, Unrealized Losses	(183)
12 Months or Greater, Fair Value	0
12 Months or Greater, Unrealized Losses	0
Total, Fair Value	6,880
Total, Unrealized Losses	(183)
Corporate certificates of deposit | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	198	200
Unrealized Gains	0	0
Unrealized Losses	(14)	(19)
Fair Value	184	181
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 Months, Fair Value	0	0
Less than 12 Months, Unrealized Losses	0	0
12 Months or Greater, Fair Value	185	181
12 Months or Greater, Unrealized Losses	(14)	(19)
Total, Fair Value	185	181
Total, Unrealized Losses	$ (14)	$ (19)

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Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5

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