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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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Deconsolidations, Discontinued Operations and Liquidation Assigned Risk Solutions Ltd Discontinued Operations (Details) - USD ($) $ in Thousands, number in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration				$ 1,700
(Loss) gain on disposal of discontinued operations, net of taxes		$ (7,136)	$ 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