Acquisition and Discontinued Operations Discontinued Operations - NSA (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
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
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
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) gain on disposal of discontinued operations, net of taxes			1,335
Other Segments [Member] | Sale of Subsidiary Gain (Loss) [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) gain on disposal of discontinued operations, net of taxes			$ (9,136)