Financial Schedules Schedule II - Statement of Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Other Income									$ 1,833	$ 1,243	$ 955
Realized investment gains (losses), net									108	518	(1,985)
Total revenue	$ 65,570	$ 61,161	$ 59,842	$ 57,433	$ 67,863	$ 64,331	$ 60,852	$ 59,581	244,006	252,627	245,406
Federal income tax expense (benefit)	(596)	12,671	(1,553)	2,542	35,069	(339)	1,524	(1,113)	13,064	35,141	3,514
Net income (loss)	$ (1,432)	$ (7,109)	$ (2,558)	$ 37	$ (44,204)	$ 3,449	$ 572	$ 2,056	(11,062)	(38,127)	1,969
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax									(25,128)	12,540	205
Comprehensive Income (Loss), Net of Tax, Attributable to Parent									(36,190)	(25,587)	2,174
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Management service fees									43,323	42,367	33,748
Investment income									1,086	1,282	1,491
Other Income									1	80	49
Realized investment gains (losses), net									(196)	0	0
Total revenue									44,214	43,729	35,288
General expenes									44,009	41,680	33,807
Taxes, licenses and fees									761	1,203	996
Federal income tax expense (benefit)									(185)	228	(196)
Total expenses									44,585	43,111	34,607
Income before equity in income of consolidated subsidiaries									(371)	618	681
Equity in income of consolidated subsidiaries									(10,691)	(38,745)	1,288
Net income (loss)									$ (11,062)	$ (38,127)	$ 1,969