Commitments and Contingencies (Details 2) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Future Minimum Lease Payments
2012 (Remaining)		$ 2,295,000		$ 2,295,000
2013		8,539,000		8,539,000
2014		6,867,000		6,867,000
2015		6,293,000		6,293,000
2016		5,340,000		5,340,000
Thereafter		44,383,000		44,383,000
Total		73,717,000		73,717,000
Sublease Rental Income
2012 (Remaining)		488,000		488,000
2013		1,737,000		1,737,000
2014		860,000		860,000
2015		502,000		502,000
Total		3,587,000		3,587,000
Net Lease Payments
2012 (Remaining)		1,807,000		1,807,000
2013		6,802,000		6,802,000
2014		6,007,000		6,007,000
2015		5,791,000		5,791,000
2016		5,340,000		5,340,000
Thereafter		44,383,000		44,383,000
Total		70,130,000		70,130,000
Rental expense, net of sublease rental income		1,300,000	1,300,000	3,700,000	4,300,000
Letters of Credit
Contingent liability under stand-by letter of credit agreements		4,900,000		4,900,000		4,900,000
Other
Deposit with FICC		8,500,000		8,500,000		15,200,000
Equity incentives of Entity common stock granted to business leaders under arrangements	6.0
Minimum cash bonuses				$ 4,400,000