Deconsolidations, Discontinued Operations and Liquidation Assets and liabilities of Mendota (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fixed maturities, at fair value (amortized cost of $12,432 and $14,707, respectively)	$ 12,260	$ 14,541
Equity investments, at fair value (cost of $2,274 and $4,868, respectively)	856	4,589
Limited liability investments	4,790	9,094
Other Investments	2,079	3,721
Investments	59,904	79,839
Less: cash and cash equivalents and restricted cash of discontinued operations at beginning of period		23,512	$ 4,524
Accrued investment income	420	507
Other receivables, net of allowance for doubtful accounts of $184 and zero, respectively	9,523	7,247
Deferred acquisition costs, net	6,904	6,325	$ 5,827
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment		222
Disposal Group, Including Discontinued Operation, Intangible Assets		7,553
Disposal Group, Including Discontinued Operation, Other Assets, Current		407
Assets held for sale	0	110,145
Unpaid loss and loss adjustment expenses	2,073	1,329
Unearned Premiums		36,686
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable, Current		1,586
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities		5,305
Liabilities held for sale	$ 0	105,900
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Fixed maturities, at fair value (amortized cost of $12,432 and $14,707, respectively)		38,673
Equity investments, at fair value (cost of $2,274 and $4,868, respectively)		4,405
Investments		43,078
Less: cash and cash equivalents and restricted cash of discontinued operations at beginning of period		23,512
Accrued investment income		195
Premiums Receivable, Net		27,855
Other receivables, net of allowance for doubtful accounts of $184 and zero, respectively		603
Deferred acquisition costs, net		6,720
Unpaid loss and loss adjustment expenses		$ 62,323