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 ($)	Parent USD ($)	Noncontrolling Interest USD ($)
Beginning Balance at Dec. 31, 2011	$ 271,515		$ 429	$ 10	$ 263,562	$ 18,279	$ (10,765)	$ 271,515
Beginning Balance, shares at Dec. 31, 2011			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			146,510
Issuance of Class A common stock, shares			12,209,000
Cost to issue equity	(11,268)				(11,268)			(11,268)
Conversion of Class B common stock to Class A common stock	0		10	(10)	0			0
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		0		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			432
Stock options exercised	3,544		3		3,541			3,544
Stock options exercised, shares			296,000
Liability based stock option awards settled	216				216			216
Issuance of common stock	620				620			620
Restricted stock issued	0		4		(4)
Restricted stock issued, shares			319,000
Restricted stock forfeited	29				29			29
Restricted stock forfeited, Shares							22,000
Restricted stock and restricted stock units expense	758				758			758
Swing sale profit contribution	(24)				(24)			(24)
Class B dividends declared	(28)					(28)		(28)
Current period net (loss) income attributable to parent	(33,261)					(33,261)		(33,261)
Beginning Balance at Dec. 31, 2012	379,104		568	0	404,311	(15,010)	(10,765)	379,104
Ending Balance, shares at Dec. 31, 2012			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			149,069
Issuance of Class A common stock, shares			9,780,000
Cost to issue equity	(7,390)				(7,390)			(7,390)
Issuance of Class A common stock to Board member and advisors	57				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			1,232
Liability based stock option awards settled	162				162			162
Restricted stock issued	0		4		(4)			0
Restricted stock issued, shares			378,000
Restricted stock forfeited	(22)				(22)			(22)
Restricted stock forfeited, Shares							105,000
Restricted stock and restricted stock units expense	1,618				1,618			1,618
Swing sale profit contribution	0
Class B dividends declared						0
Current period net (loss) income attributable to parent	45,094					45,094		45,094
Beginning Balance at Dec. 31, 2013	568,924		670	0	548,935	30,084	(10,765)	568,924
Ending Balance, shares at Dec. 31, 2013		65,652,690	66,959,000	0			1,306,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock	181,875		75		181,800			181,875
Issuance of Class A common stock, shares			7,500,000
Cost to issue equity	(590)				(590)			(590)
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	16				16			16
Issuance of Class A common stock to Board member and advisors, shares			30,000
Stock options expense related to equity based awards	2,279				2,279			2,279
Stock options exercised	43				43			43
Stock options exercised, shares	10,000		8,000
Liability based stock option awards settled	84				84			84
Restricted stock issued	0		2		(2)			0
Restricted stock issued, shares			212,000
Restricted stock forfeited	(17)				(17)			(17)
Restricted stock forfeited, Shares							60,000
Restricted stock and restricted stock units expense	3,023				3,023			3,023
Cancellation of treasury stock			(13)		(10,752)		10,765
Cancellation of treasury stock (shares)			(1,335,000)				(1,335,000)
Proceeds from Noncontrolling Interests	150								150
Swing sale profit contribution	0
Current period net (loss) income attributable to parent	110,771					110,771		110,771
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	110,754								(17)
Beginning Balance at Dec. 31, 2014	$ 866,541		$ 734		$ 724,819	$ 140,855	$ 0	$ 866,408	$ 133
Ending Balance, shares at Dec. 31, 2014		73,342,777	73,374,000				31,000