Reserves for Losses and Loss Adjustment Expenses (Incurred and Paid Claims Development - Aviation) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) claim	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development	$ 112,300	$ 6,000
Incurred claims and claim adjustment expenses related to current year	117,644	151,603
Total incurred	323,499	275,244
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Total paid	292,089	279,046
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	460,176	428,766	$ 432,568
General Aviation and Satellite Component [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total incurred	36,970
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Total paid	33,054
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	3,916
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized In 2013 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		10,293	10,507	$ 10,252	$ 10,649	$ 10,057	$ 9,563	$ 10,295	$ 11,304	$ 10,236
Incurred claims and claim adjustment expenses related to current year	$ 10,278
Cumulative number of reported claims | claim	231
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 10,278	10,278	10,281	10,242	10,456	9,944	9,356	9,584	9,493	$ 6,537
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized In 2014 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		3,567	3,567	3,567	3,566	3,558	3,627	3,654	3,179
Incurred claims and claim adjustment expenses related to current year	$ 3,568
Cumulative number of reported claims | claim	201
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 3,568	3,567	3,567	3,567	3,565	3,327	3,259	3,105	$ 2,779
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized in 2015 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		1,639	1,635	1,630	1,631	1,643	1,709	1,870
Incurred claims and claim adjustment expenses related to current year	$ 1,638
Cumulative number of reported claims | claim	200
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 1,636	1,636	1,634	1,630	1,601	1,520	1,405	$ 958
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized in 2016 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		2,216	2,183	2,219	2,119	2,241	2,330
Incurred claims and claim adjustment expenses related to current year	$ 2,215
Cumulative number of reported claims | claim	292
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 2,215	2,216	2,216	2,082	1,918	1,907	$ 1,469
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized in 2017 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		2,183	2,117	2,079	2,082	2,325
Incurred claims and claim adjustment expenses related to current year	$ 2,182
Cumulative number of reported claims | claim	320
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 2,180	2,182	2,054	2,021	1,837	$ 1,260
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized In 2018 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		2,577	2,296	1,990	2,382
Incurred claims and claim adjustment expenses related to current year	2,611
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 14
Cumulative number of reported claims | claim	338
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 2,548	2,412	2,368	2,237	$ 1,716
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized In 2019 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		4,592	2,206	5,246
Incurred claims and claim adjustment expenses related to current year	4,806
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 29
Cumulative number of reported claims | claim	312
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 4,416	4,151	3,787	$ 2,774
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized In 2020 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		3,318	1,104
Incurred claims and claim adjustment expenses related to current year	3,365
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 108
Cumulative number of reported claims | claim	294
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 2,943	2,813	$ 2,120
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized In 2021 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable net prior year development		3,562
Incurred claims and claim adjustment expenses related to current year	2,690
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 302
Cumulative number of reported claims | claim	211
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 1,968	$ 1,414
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized In 2022 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Incurred claims and claim adjustment expenses related to current year	3,617
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,728
Cumulative number of reported claims | claim	155
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to current year	$ 1,302