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Acquisitions (Results of Operations on Acquisition Included Consolidated Financial Statements) (Details) (USD $)
In Thousands, except Per Share data

3 Months Ended

6 Months Ended

Jun. 30, 2011

Jun. 30, 2010

Jun. 30, 2011

Jun. 30, 2010

Diluted

$ 0.05

^[1]

$ 0.40

^[1]

$ 0.55

^[1]

$ 0.85

^[1]

Thomas Weisel Partners Group Inc [Member]

Total net revenues

$ 366,471

$ 730,667

Net loss

$ (101,312)

$ (51,738)

Basic

$ (1.91)

$ (0.98)

Diluted

$ (1.91)

$ (0.98)

[1]	Diluted earnings per share is computed on the basis of the weighted average number of shares of common stock plus the effect of dilutive potential common shares outstanding during the period using the treasury stock method. Diluted earnings per share include stock options and units.

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details