Fair Value Measurements (Available for Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	$ 222,134	$ 169,876
Unrealized Gains	1,272	180
Unrealized Losses	(6,158)	(10,272)
Fair Value	217,248	159,784
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	17,748	88,007
Less than 12 months, unrealized losses	(64)	(3,199)
12 Months or greater, fair value	120,731	67,173
12 Months or greater, unrealized losses	(6,094)	(7,073)
Total, fair value	138,479	155,180
Total, unrealized losses	(6,158)	(10,272)
Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Amortized cost, due within one year	32,586
Fair value, due within one year	32,241
Amortized cost, due after one year through five years	179,451
Fair value, due after one year through five years	175,907
Amortized cost, due after five years	10,097
Fair value, due after five years	9,100
Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	133,710	98,090
Unrealized Gains	785	14
Unrealized Losses	(4,208)	(6,548)
Fair Value	130,287	91,556
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	6,350	53,454
Less than 12 months, unrealized losses	(9)	(2,356)
12 Months or greater, fair value	71,005	34,782
12 Months or greater, unrealized losses	(4,199)	(4,192)
Total, fair value	77,355	88,236
Total, unrealized losses	(4,208)	(6,548)
Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	88,424	71,786
Unrealized Gains	487	166
Unrealized Losses	(1,950)	(3,724)
Fair Value	86,961	68,228
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	11,398	34,553
Less than 12 months, unrealized losses	(55)	(843)
12 Months or greater, fair value	49,726	32,391
12 Months or greater, unrealized losses	(1,895)	(2,881)
Total, fair value	61,124	66,944
Total, unrealized losses	(1,950)	(3,724)
Corporate debt securities | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	95,903	53,452
Unrealized Gains	762	1
Unrealized Losses	(2,202)	(3,550)
Fair Value	94,463	49,903
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	4,971	23,559
Less than 12 months, unrealized losses	(3)	(733)
12 Months or greater, fair value	40,649	25,842
12 Months or greater, unrealized losses	(2,199)	(2,817)
Total, fair value	45,620	49,401
Total, unrealized losses	(2,202)	(3,550)
Corporate debt securities | Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	87,601	70,968
Unrealized Gains	246	1
Unrealized Losses	(1,950)	(3,724)
Fair Value	85,897	67,245
U.S. government agency securities | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	29,082	34,920
Unrealized Gains	18	13
Unrealized Losses	(1,054)	(1,688)
Fair Value	28,046	33,245
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	1,280	24,834
Less than 12 months, unrealized losses	(4)	(939)
12 Months or greater, fair value	22,858	5,593
12 Months or greater, unrealized losses	(1,050)	(749)
Total, fair value	24,138	30,427
Total, unrealized losses	(1,054)	(1,688)
Municipal bonds | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	8,227	9,211
Unrealized Gains	5	0
Unrealized Losses	(914)	(1,257)
Fair Value	7,318	7,954
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	99	4,998
Less than 12 months, unrealized losses	(2)	(672)
12 Months or greater, fair value	7,038	2,956
12 Months or greater, unrealized losses	(912)	(585)
Total, fair value	7,137	7,954
Total, unrealized losses	(914)	(1,257)
Municipal bonds | Investments in lieu of retention:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	823	818
Unrealized Gains	241	165
Unrealized Losses	0	0
Fair Value	1,064	983
Corporate certificates of deposit | Restricted investments:
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Amortized Cost	498	507
Unrealized Gains	0	0
Unrealized Losses	(38)	(53)
Fair Value	460	454
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
Less than 12 months, fair value	0	63
Less than 12 months, unrealized losses	0	(12)
12 Months or greater, fair value	460	391
12 Months or greater, unrealized losses	(38)	(41)
Total, fair value	460	454
Total, unrealized losses	$ (38)	$ (53)