Acquisitions, Deconsolidation and Discontinued Operations Discontinued Operations of Assigned Risk Solutions Ltd. (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Apr. 01, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration		$ 1,300	$ 1,400		$ 1,300	$ 1,400
Premiums, Percentage Assumed to Net					1.30%
Proceeds from Divestiture of Interest in Consolidated Subsidiaries	$ 47,000			$ 2,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal		1,017	1,124		$ 1,017	1,124
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation		0	0		0	0
Gain on disposal of discontinued operations, net of taxes		$ 1,017	$ 1,124		$ 1,017	$ 1,124