Reinsurance and Policy Benefits and Losses, Claims, and Loss Expenses Payable (Incurred Claims Development) (Details) $ in Thousands	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 ($)
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 16,924
Accident Year 2013 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	9,594	$ 9,595	$ 9,576	$ 9,741	$ 9,914	$ 9,853	$ 9,861
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 0
Shortduration Insurance Contracts Number Of Reported Claims	7,652
Accident Year 2014 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 10,493	10,748	10,759	10,720	10,907	$ 11,691
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 78
Shortduration Insurance Contracts Number Of Reported Claims	9,627
Accident Year 2015 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 11,087	12,464	12,460	12,459	$ 12,214
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 0
Shortduration Insurance Contracts Number Of Reported Claims	10,652
Accident Year 2016 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 11,790	13,056	13,011	$ 13,297
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 0
Shortduration Insurance Contracts Number Of Reported Claims	10,954
Accident Year 2017 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 17,078	16,109	$ 15,749
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 1,411
Shortduration Insurance Contracts Number Of Reported Claims	11,291
Accident Year 2018 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 18,386	$ 19,580
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 4,692
Shortduration Insurance Contracts Number Of Reported Claims	11,083
Accident Year 2019 [Member]
Incurred claims development [Abstract]
Shortduration Insurance Contracts Incurred Claims And Allocated Claim Adjustment Expense Net	$ 22,138
Shortduration Insurance Contracts Incurred But Not Reported Ibnr Claims Liability Net	$ 10,743
Shortduration Insurance Contracts Number Of Reported Claims	10,745