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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Computations of basic and diluted net income per share
The computations of basic and diluted net income per share are as follows:
 
   
Three Months Ended June 30,
  
Six Months Ended June 30,
 
(in thousands, except per share amounts)
 
2012
  
2011
  
2012
  
2011
 
Basic:
            
Net income attributable to GAMCO Investors, Inc.'s shareholders
 $15,105  $20,647  $38,941  $38,290 
Weighted average shares outstanding
  26,258   26,665   26,338   26,783 
Basic net income attributable to GAMCO Investors, Inc.'s
                
  shareholders per share
 $0.58  $0.77  $1.48  $1.43 
                  
Diluted:
                
Net income attributable to GAMCO Investors, Inc.'s shareholders
 $15,105  $20,647  $38,941  $38,290 
                  
Weighted average share outstanding
  26,258   26,665   26,338   26,783 
Dilutive stock options and restricted stock awards
  168   68   163   89 
Total
  26,426   26,733   26,501   26,872 
Diluted net income attributable to GAMCO Investors, Inc.'s
                
  shareholders per share
 $0.57  $0.77  $1.47  $1.42