Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Total	Common Class A [Member]	Common Class B [Member]	Accumulated deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury stock [Member]
Balance at Dec. 31, 2011	$ 248,042	$ 258,548	$ 3,184	$ (21,851)	$ 19,172	$ (11,011)
Balance, shares at Dec. 31, 2011		52,089,000	1,002,000			(3,136,000)
Net income (loss)	4,529			4,529
Unrealized investment gains (losses), net	9,715				9,715
Total comprehensive income	14,244			4,529	9,715
Warrants exercised	822	835		(13)
Warrants exercised, shares		127,000	0			0
Balance at Dec. 31, 2012	263,108	259,383	3,184	(17,335)	28,887	(11,011)
Balance, shares at Dec. 31, 2012		52,216,000	1,002,000			(3,136,000)
Net income (loss)	4,793			4,793
Unrealized investment gains (losses), net	(22,092)				(22,092)
Total comprehensive income	(17,299)			4,793	(22,092)
Warrants exercised	0	0		0
Warrants exercised, shares		0	0			0
Balance at Dec. 31, 2013	245,809	259,383	3,184	(12,542)	6,795	(11,011)
Balance, shares at Dec. 31, 2013		52,216,000	1,002,000			(3,136,000)
Net income (loss)	(6,505)			(6,505)
Unrealized investment gains (losses), net	19,055				19,055
Total comprehensive income	12,550			(6,505)	19,055
Warrants exercised	0
Warrants exercised, shares		0	0			0
Balance at Dec. 31, 2014	$ 258,359	$ 259,383	$ 3,184	$ (19,047)	$ 25,850	$ (11,011)
Balance, shares at Dec. 31, 2014		52,216,000	1,002,000			(3,136,000)