Claims Reserve Cumulative claims paid and claims adjustment expenses (Details) $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Other Segments [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 85,587
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 5,653
Other Segments [Member] | Short-duration Insurance Contracts, Accident Year 2017 [Member]
Claims Development [Line Items]
Short-duration Insurance Contract, Cumulative Number of Reported Claims	105,891
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 14,471	$ 14,420	$ 14,738
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 5
Other Segments [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]
Claims Development [Line Items]
Short-duration Insurance Contract, Cumulative Number of Reported Claims	59,665
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 8,862	8,855	8,843	$ 9,027
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1
Other Segments [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]
Claims Development [Line Items]
Short-duration Insurance Contract, Cumulative Number of Reported Claims	262,083
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 38,883
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 5,627
Other Segments [Member] | Short-duration Insurance Contracts, Accident Year 2018 [Member]
Claims Development [Line Items]
Short-duration Insurance Contract, Cumulative Number of Reported Claims	173,778
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 23,371	23,782
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	20
Subscription business [Member]
Claims Development [Line Items]
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	703,077
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 15,541
Subscription business [Member] | Short-duration Insurance Contracts, Accident Year 2017 [Member]
Claims Development [Line Items]
Short-duration Insurance Contract, Cumulative Number of Reported Claims	725,796
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 155,681	155,678	155,398
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 464
Subscription business [Member] | Short-duration Insurance Contracts, Accident Year 2016 [Member]
Claims Development [Line Items]
Short-duration Insurance Contract, Cumulative Number of Reported Claims	600,143
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 124,040	124,035	$ 123,954	$ 124,169
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 137
Subscription business [Member] | Short-duration Insurance Contracts, Accident Year 2019 [Member]
Claims Development [Line Items]
Short-duration Insurance Contract, Cumulative Number of Reported Claims	965,768
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 232,552
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 13,575
Subscription business [Member] | Short-duration Insurance Contracts, Accident Year 2018 [Member]
Claims Development [Line Items]
Short-duration Insurance Contract, Cumulative Number of Reported Claims	870,806
Short-duration Insurance Contracts, Incurred Claims and Allocated Claim Adjustment Expense, Net	$ 190,804	$ 190,316
Short-duration Insurance Contracts, Incurred but Not Reported (IBNR) Claims Liability, Net	$ 1,365