Reserves for Losses and Loss Adjustment Expenses (Incurred and Paid Claims Development - Aviation) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) claim	Dec. 31, 2020 USD ($)	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 ($)	Dec. 31, 2012 USD ($)
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development	$ 6,040	$ 58,288
Incurred claims and claim adjustment expenses related to current year	269,204	326,919
Total incurred	275,244	406,907
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	177,571	185,407
Paid claims and allocated claim adjustment expenses related to current year	101,475	113,312
Total paid	279,046	320,419
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	428,766	432,568	$ 346,080
Loss Adjustment Expenses Recognized In 2012 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years										$ 1,181
General Aviation and Satellite Component [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total incurred	40,514
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Total paid	37,238
Liabilities for unpaid claims and claim adjustment expenses, net of reinsurance	3,276
General Aviation and Satellite Component [Member] | Loss Adjustment Expenses Recognized In 2012 [Member]
Liability For Unpaid Claims and Claims Adjustment Expense, Incurred Claims [Abstract]
Total unfavorable (favorable) net prior year development		9,446	9,941	$ 9,941	$ 10,021	$ 10,024	$ 10,336	$ 10,353	$ 10,738	10,988
Incurred claims and claim adjustment expenses related to current year	$ 10,040
Cumulative number of reported claims | claim	229
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 10,040	9,446	9,941	10,041	10,041	10,041	10,049	9,672	8,486	$ 5,641
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 (favorable) net prior year development		10,297	10,252	10,649	10,057	9,563	10,295	11,304	10,236
Incurred claims and claim adjustment expenses related to current year	$ 10,254
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	$ 10,239	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 (favorable) net prior year development		3,567	3,567	3,566	3,558	3,627	3,654	3,179
Incurred claims and claim adjustment expenses related to current year	$ 3,567
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	$ 3,567	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 (favorable) net prior year development		1,635	1,630	1,631	1,643	1,709	1,870
Incurred claims and claim adjustment expenses related to current year	$ 1,635
Cumulative number of reported claims | claim	198
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 1,633	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 (favorable) net prior year development		2,220	2,219	2,119	2,241	2,330
Incurred claims and claim adjustment expenses related to current year	$ 2,082
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	$ 2,082	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 (favorable) net prior year development		2,178	2,079	2,082	2,325
Incurred claims and claim adjustment expenses related to current year	$ 2,150
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	$ 2,149	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 (favorable) net prior year development		2,565	1,990	2,382
Incurred claims and claim adjustment expenses related to current year	2,446
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 31
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	$ 2,282	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 (favorable) net prior year development		4,525	5,246
Incurred claims and claim adjustment expenses related to current year	3,580
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 70
Cumulative number of reported claims | claim	305
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 3,139	3,787	$ 2,911
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 (favorable) net prior year development		3,487
Incurred claims and claim adjustment expenses related to current year	1,198
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 246
Cumulative number of reported claims | claim	289
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to prior years	$ 693	$ 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]
Incurred claims and claim adjustment expenses related to current year	3,562
Total of incurred-but-not-reported liabilities plus expected development on reported claims	$ 1,866
Cumulative number of reported claims | claim	194
Liability For Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract]
Paid claims and allocated claim adjustment expenses related to current year	$ 1,414