Employee Benefit and Incentive Plans (Details 1) (USD $)			6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Restricted Class A Common Stock Plans		Jun. 30, 2011 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	1,194,655		244,424		32,785
Granted			375,000		300,000
Vested, deferred or forfeited			(82,888)
Vested					(88,361)
Unvested share-based compensation, shares	1,194,655		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.