Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands	Total	Accumulated deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury stock [Member]	Common Class A [Member]	Common Class A [Member] Common Stock [Member]	Common Class B [Member]	Common Class B [Member] Common Stock [Member]
Balance (Scenario, Previously Reported [Member]) at Dec. 31, 2013	$ 245,809,000	$ (12,542,000)
Balance (Restatement Adjustment [Member])	3,438,000
Balance at Dec. 31, 2013	249,247,000		$ 6,795,000	$ (11,011,000)		$ 259,383,000		$ 3,184,000
Cumulative effect of correction of prior years errors - Note 1 | Restatement Adjustment [Member]	3,438,000	3,438,000
Balance at Jan. 01, 2014	249,247,000	(9,104,000)	6,795,000	(11,011,000)		259,383,000		3,184,000
Balance (Scenario, Previously Reported [Member]) at Dec. 31, 2013	245,809,000	(12,542,000)
Balance (Restatement Adjustment [Member])	3,438,000
Balance at Dec. 31, 2013	249,247,000		6,795,000	(11,011,000)		259,383,000		3,184,000
Net income (loss) | Scenario, Previously Reported [Member]	(6,505,000)
Net income (loss) | Restatement Adjustment [Member]	535,000
Net income (loss)	(5,970,000)
Unrealized investment gains (losses), net	19,055,000
Total comprehensive income | Scenario, Previously Reported [Member]	12,550,000
Total comprehensive income | Restatement Adjustment [Member]	535,000
Total comprehensive income	13,085,000
Balance (Scenario, Previously Reported [Member]) at Dec. 31, 2014	258,359,000
Balance (Restatement Adjustment [Member])	3,973,000
Balance at Dec. 31, 2014	262,332,000	(15,074,000)	25,850,000	$ (11,011,000)		259,383,000		3,184,000
Balance, shares at Dec. 31, 2014				(3,136)	52,216		1,002
Balance at Jan. 01, 2014	249,247,000	(9,104,000)	6,795,000	$ (11,011,000)		259,383,000		3,184,000
Net income (loss)	(5,970,000)	(5,970,000)
Unrealized investment gains (losses), net	19,055,000		19,055,000
Total comprehensive income	13,085,000	(5,970,000)	19,055,000
Balance (Scenario, Previously Reported [Member]) at Dec. 31, 2014	258,359,000
Balance (Restatement Adjustment [Member])	3,973,000
Balance at Dec. 31, 2014	262,332,000	(15,074,000)	25,850,000	$ (11,011,000)		259,383,000		3,184,000
Balance, shares at Dec. 31, 2014				(3,136)	52,216		1,002
Net income (loss) | Scenario, Previously Reported [Member]	(3,579,000)
Net income (loss) | Restatement Adjustment [Member]	436,000
Net income (loss)	(3,143,000)	(3,143,000)
Unrealized investment gains (losses), net	(12,263,000)		(12,263,000)
Total comprehensive income | Scenario, Previously Reported [Member]	(15,842,000)
Total comprehensive income | Restatement Adjustment [Member]	436,000
Total comprehensive income	(15,406,000)	(3,143,000)	(12,263,000)
Balance (Scenario, Previously Reported [Member]) at Dec. 31, 2015	242,517,000
Balance (Restatement Adjustment [Member])	4,409,000
Balance at Dec. 31, 2015	246,926,000	(18,217,000)	13,587,000	$ (11,011,000)		259,383,000		3,184,000
Balance, shares at Dec. 31, 2015				(3,136)	52,216		1,002
Net income (loss)	1,969,000	1,969,000
Unrealized investment gains (losses), net	205,000		205,000
Total comprehensive income	2,174,000	1,969,000	205,000
Balance at Dec. 31, 2016	$ 249,100,000	$ (16,248,000)	$ 13,792,000	$ (11,011,000)		$ 259,383,000		$ 3,184,000
Balance, shares at Dec. 31, 2016				(3,136)	52,216		1,002