Financial Schedules Schedule II - Condensed Financial Information (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Fixed maturities available-for-sale, at fair value	$ 974,609	$ 881,668
Fixed maturities held-to-maturity, at amortized cost	233,961	247,004
Equity securities	16,164	18,159
Real estate and other long-term investments	7,416	5,919
Short-term investments	0	508
Cash and cash equivalents	46,064	35,510	$ 82,827	$ 50,708
Accrued investment income	19,062	17,903
Property and equipment, net	6,624	7,890
Other assets	912	918
Total assets	1,644,453	1,583,668	1,480,751
Total liabilities	1,420,940	1,334,568	1,233,825
Accumulated deficit	(54,375)	(16,248)	(18,217)
Unrealized investment gains on securities held by parent and subsidaries, net of tax	26,332	13,792
Treasury stock	(11,011)	(11,011)
Total stockholders' equity	223,513	249,100	246,926	262,332
Total liabilities and stockholders' equity	1,644,453	1,583,668	1,480,751
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiary	158,453	173,877
Fixed maturities available-for-sale, at fair value	39,521	51,028
Fixed maturities held-to-maturity, at amortized cost	350	357
Equity securities	1,133	1,030
Real estate and other long-term investments	5,832	5,920
Short-term investments	0	508
Cash and cash equivalents	23,850	14,673	$ 15,756	$ 14,816
Accrued investment income	576	757
Accounts receivable from subsidiaries	5,489	2,658
Property and equipment, net	789	746
Other assets	290	237
Total assets	236,283	251,791
Accrued expenses and other liabilities	12,770	2,691
Total liabilities	12,770	2,691
Accumulated deficit	(54,375)	(16,248)
Unrealized investment gains on securities held by parent and subsidaries, net of tax	26,332	13,792
Treasury stock	(11,011)	(11,011)
Total stockholders' equity	223,513	249,100
Total liabilities and stockholders' equity	236,283	251,791
Common Class A [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock	259,383	259,383
Common Class A [Member] | Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock	259,383	259,383
Common Class B [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock	3,184	3,184
Common Class B [Member] | Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Common Stock	$ 3,184	$ 3,184