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, 2009 (Scenario, Previously Reported [Member])	$ 216,075	$ 256,703	$ 3,184	$ (38,092)	$ 5,291	$ (11,011)
Balance at Dec. 31, 2009	209,132	256,703	3,184	(45,035)	5,291	(11,011)
Balance, shares at Dec. 31, 2009		51,822,000	1,002,000			(3,136,000)
Net income	14,704			14,704
Net income at Jan. 01, 2010 (Scenario, Previously Reported [Member])	15,511
Net income (Restatement Adjustment [Member])	(807)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(3,952)
Total comprehensive income	10,752			14,704	(3,952)
Total stock issued, shares		0	0			0
Balance at Dec. 31, 2010	219,884	256,703	3,184	(30,331)	1,339	(11,011)
Balance, shares at Dec. 31, 2010		51,822,000	1,002,000			(3,136,000)
Net income	8,482			8,482
Net income at Jan. 01, 2011 (Scenario, Previously Reported [Member])	8,375
Net income (Restatement Adjustment [Member])	107
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	17,833
Total comprehensive income	26,315			8,482	17,833
Warrants exercised	1,843	1,845		(2)
Warrants exercised, shares		267,000	0			0
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	4,529			4,529
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	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)