Financial Schedules Schedule II - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Debt Securities, Available-for-sale	$ 1,377,959	$ 1,231,039
Real estate and other long-term investments	0	5,718
Short-term investments	1,301	7,865
Cash and cash equivalents	46,205	45,492	$ 46,064	$ 35,510
Accrued investment income	17,453	18,467
Property and equipment, net	5,904	5,943
Other assets	2,489	1,912
Total assets	1,744,936	1,615,561
Total liabilities	1,485,100	1,427,828
Accumulated deficit	(70,969)	(69,599)
Unrealized investment gains on securities held by parent and subsidaries, net of tax	77,117	5,366
Treasury stock	(11,011)	(11,011)
Total stockholders' equity	259,836	187,733	223,513	249,100
Total liabilities and stockholders' equity	1,744,936	1,615,561
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Investment in subsidiary	191,869	123,245
Debt Securities, Available-for-sale	50,491	41,705
Equity securities	1,167	1,035
Real estate and other long-term investments	2,571	5,718
Short-term investments	1,301	7,865
Cash and cash equivalents	10,829	11,768	$ 23,850	$ 14,673
Accrued investment income	535	530
Accounts receivable from subsidiaries	4,770	5,871
Property and equipment, net	817	425
Other assets	552	305
Total assets	264,902	198,467
Accrued expenses and other liabilities	5,066	10,734
Total liabilities	5,066	10,734
Accumulated deficit	(70,969)	(69,599)
Unrealized investment gains on securities held by parent and subsidaries, net of tax	77,117	5,366
Treasury stock	(11,011)	(11,011)
Total stockholders' equity	259,836	187,733
Total liabilities and stockholders' equity	264,902	198,467
Common Class A [Member]
Condensed Financial Statements, Captions [Line Items]
Common stock	261,515	259,793
Common Class A [Member] | Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Common stock	261,515	259,793
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