Reinsurance (Cumulative Incurred Claims) (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 155,100,000
Claims Reserve	$ 2,400,000
Cumulative Number Of Reported Claims	123,488
Incident Year - Four Years Prior [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 22,600,000	$ 22,600,000	$ 22,600,000	$ 22,500,000	$ 22,300,000
Claims Reserve	$ 0
Cumulative Number Of Reported Claims	20,462
Incident Year - Three Years Prior [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 25,800,000	25,800,000	25,700,000	$ 25,800,000
Claims Reserve	$ 0
Cumulative Number Of Reported Claims	22,310
Incident Year - Two Years Prior [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 30,200,000	30,200,000	$ 30,100,000
Claims Reserve	$ 0
Cumulative Number Of Reported Claims	24,419
Incident Year - Prior Year [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 37,600,000	$ 37,700,000
Claims Reserve	$ 0
Cumulative Number Of Reported Claims	28,206
Incident Year - Current Year [Member]
Cumulative Incurred Claims [Line Items]
Cumulative Incurred Claims	$ 38,900,000
Claims Reserve	$ 2,400,000
Cumulative Number Of Reported Claims	28,091