Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Class A	Common stock Class A USD ($)	Common stock Class B USD ($)	Additional paid-in capital USD ($)	Retained earnings (deficit) USD ($)	Treasury stock USD ($)
Beginning Balance at Dec. 31, 2010	$ 281,877		$ 427	$ 10	$ 263,342	$ 28,863	$ (10,765)
Beginning Balance, shares at Dec. 31, 2010			42,750,000	1,031,000			1,179,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock	592		1		591
Issuance of Class A common stock, shares			54,000
Cost to issue equity	(1,667)				(1,667)
Issuance of Class A common stock to Board member and advisors	230				230
Issuance of Class A common stock to Board member and advisors, shares			20,000
Stock options exercised	1,023		1		1,022
Stock options exercised, shares			93,000
Restricted stock vested	44				44
Swing sale profit contribution	0
Class B dividends declared	(275)					(275)
Current period net (loss) income	(10,309)					(10,309)
Ending Balance at Dec. 31, 2011	271,515		429	10	263,562	18,279	(10,765)
Ending Balance, shares at Dec. 31, 2011		55,577,667	42,917,000	1,031,000			1,179,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock	146,510		122		146,388
Issuance of Class A common stock, shares			12,209,000
Cost to issue equity	(11,268)				(11,268)
Conversion of Class B common stock to Class A common stock			10	(10)
Conversion of Class B common stock to Class A common stock, shares			1,031,000	(1,031,000)
Issuance of Class A common stock to Board member and advisors	71				71
Issuance of Class A common stock to Board member and advisors, shares			7,000
Stock options expense related to equity based awards	432				432
Stock options exercised	3,544		3		3,541
Stock options exercised, shares			296,000
Liability based stock option awards settled	216				216
Changes in fair value for liability-based awards for which grant date fair value is in excess of fair value	620				620
Restricted stock issued			4		(4)
Restricted stock issued, shares			319,000
Restricted stock forfeited	(29)				(29)
Restricted stock forfeited, Shares							22,000
Restricted stock and restricted stock units expense	758				758
Swing sale profit contribution	24				24
Class B dividends declared	(28)					(28)
Current period net (loss) income	(33,261)					(33,261)
Ending Balance at Dec. 31, 2012	379,104		568	0	404,311	(15,010)	(10,765)
Ending Balance, shares at Dec. 31, 2012		65,652,690	56,779,000	0			1,201,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock	149,069		98		148,971
Issuance of Class A common stock, shares			9,780,000
Cost to issue equity	(7,390)				(7,390)
Conversion of Class B common stock to Class A common stock, shares		1,030,700
Issuance of Class A common stock to Board member and advisors	57				57
Issuance of Class A common stock to Board member and advisors, shares			22,000
Stock options expense related to equity based awards	1,232				1,232
Stock options exercised, shares	5,000
Liability based stock option awards settled	162				162
Restricted stock issued	0		4		(4)
Restricted stock issued, shares			378,000
Restricted stock forfeited	(22)				(22)
Restricted stock forfeited, Shares							105,000
Restricted stock and restricted stock units expense	1,618				1,618
Swing sale profit contribution	0
Current period net (loss) income	45,094					45,094
Ending Balance at Dec. 31, 2013	$ 568,924		$ 670		$ 548,935	$ 30,084	$ (10,765)
Ending Balance, shares at Dec. 31, 2013			66,959,000				1,306,000