Employee Benefit and Incentive Plans (Details 1) (USD $)	9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011
Unvested share-based compensation, shares	1,213,051
Restricted Class A Common Stock Plans
Unvested, beginning balance	$ 2.65		$ 5.67
Granted	$ 2.77		$ 2.29
Vested, deferred or forfeited	$ 3.56
Vested			$ 2.62
Unvested, ending balance	$ 2.64		$ 2.65
Beginning balance	244,424		32,785
Granted	375,000		300,000
Vested, deferred or forfeited	(82,888)
Vested			(88,361)
Unvested share-based compensation, shares	536,536	[1]	244,424

[1] Includes (i) 275,000 performance based awards that contingently vest upon the attainment of certain specified performance measures, and (ii) 250,000 time based awards that vest based upon an employee's continued employment on pre-established vesting dates.