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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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Percentage of assumed premium earned to premium earned after effects of reinsurance, as disclosed in supplementary reinsurance information.

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Acquisition and Discontinued Operations Assigned Risk Solutions Ltd. Discontinued Operations (Details) - USD ($) $ in Thousands, number in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration	$ 1,700			$ 1,700
(Loss) gain on disposal of discontinued operations, net of taxes	(6,628)	$ 1,017	$ 1,017	$ (6,628)	$ 1,017
Discontinued Operations, Disposed of by Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
SEC Schedule, 12-17, Insurance Companies, Reinsurance, Premium, Percentage Assumed to Net						0.00%
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