Acquisition and Discontinued Operations Discontinued Operations - Mendota Companies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance					$ 28,600
Restricted Cash	$ 14,167		$ 14,167			$ 14,985
Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount					$ 2,500
(Loss) gain on disposal of discontinued operations, net of taxes	(1,172)	$ 0	(7,800)	$ 1,017
Other Segments [Member] | Sale of Subsidiary Gain (Loss) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restricted Cash	5,000		5,000
(Loss) gain on disposal of discontinued operations, net of taxes	$ (1,172)		$ (9,136)