Acquisition and Discontinued Operations Balance Sheets of Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 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 $11,605 and $14,707, respectively)	$ 11,361		$ 14,541
Equity investments, at fair value (cost of $2,340 and $4,868, respectively)	2,433		4,589
Investments	71,037		79,839
Less: cash and cash equivalents and restricted cash of discontinued operations at beginning of period			23,512			$ 4,524
Accrued investment income	301		507
Other receivables, net of allowance for doubtful accounts of zero and zero, respectively	8,864		7,247
Deferred acquisition costs, net	6,662	$ 6,428	6,325	$ 6,054	$ 5,867	$ 5,827
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment	162		222
Disposal Group, Including Discontinued Operation, Intangible Assets	0		7,553
Disposal Group, Including Discontinued Operation, Other Assets, Current	138		299
Assets held for sale	115,107		110,145
Unpaid loss and loss adjustment expenses	2,594		1,329	$ 1,800
Reinsurance Payable	14,869		82
Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities	4,211		5,223
Liabilities held for sale	112,866		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 $11,605 and $14,707, respectively)	42,714		38,673
Equity investments, at fair value (cost of $2,340 and $4,868, respectively)	3,437		4,405
Investments	46,151		43,078
Less: cash and cash equivalents and restricted cash of discontinued operations at beginning of period	18,520		23,512
Accrued investment income	239		195
Premiums Receivable, Net	27,673		27,855
Other receivables, net of allowance for doubtful accounts of zero and zero, respectively	174		603
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments	6,509		108
Prepaid Reinsurance Premiums	13,493		0
Deferred acquisition costs, net	2,048		6,720
Unpaid loss and loss adjustment expenses	58,817		62,323
Unearned Premiums	34,969		36,686
Disposal Group, Including Discontinued Operation, Accrued Income Tax Payable, Current	$ 0		$ 1,586