Liability for Unpaid Claims and Claim Adjustment Expenses Rollforward of Claim Liability Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Prior Year Claims and Claims Adjustment Expense	$ 2,362	$ 6,966
Non-Standard Auto
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Prior Year Claims and Claims Adjustment Expense		3,295
Warranty
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]
Prior Year Claims and Claims Adjustment Expense		$ 3,831