Quarterly report pursuant to Section 13 or 15(d)

Acquisitions (Pro Forma) (Details)

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Acquisitions (Pro Forma) (Details) (Highland Capital Brokerage, Inc. (Highland), USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Highland Capital Brokerage, Inc. (Highland)
       
Business Acquisition [Line Items]        
Revenue $ 227,641 $ 217,980 $ 686,110 $ 631,004
Net income (loss) 11,008 1,637 16,501 (1,858)
Net loss available to common shareholders $ (7,610) $ (2,428) $ (9,436) $ (9,775)
Basic and diluted loss per share available to common shareholders $ (0.04) $ (0.01) $ (0.05) $ (0.05)
Weighted average common shares outstanding:        
Basic and diluted 183,816,643 184,300,067 184,045,751 185,436,714