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Quarterly Financial Information (Unaudited)
12 Months Ended
Dec. 31, 2017
Quarterly Financial Information (Unaudited) [Abstract]  
Quarterly Financial Information
R. Quarterly Financial Information (Unaudited)

Quarterly financial information for the years ended December 31, 2017 and 2016 is presented below.

  
2017
 
  
1st
  
2nd
  
3rd
  
4th
  
Total
 
(In thousands, except per share data)
               
Revenues
 
$
85,917
  
$
87,600
  
$
88,341
  
$
98,666
  
$
360,524
 
Operating income
  
42,443
   
39,660
   
23,393
   
39,524
   
145,020
 
Net income attributable to GAMCO
                    
Investors, Inc.'s shareholders
  
24,820
   
22,894
   
16,600
   
13,495
   
77,809
 
Net income attributable to GAMCO
                    
Investors, Inc.'s shareholders per share:
                    
Basic
  
0.86
   
0.79
   
0.57
   
0.46
   
2.68
 
Diluted
 
$
0.82
  
$
0.76
  
$
0.55
  
$
0.46
  
$
2.60
 

  
2016
 
  
1st
  
2nd
  
3rd
  
4th
  
Total
 
                
Revenues
 
$
81,385
  
$
83,944
  
$
87,721
  
$
99,950
  
$
353,000
 
Operating income
  
44,942
   
46,747
   
48,076
   
52,031
   
191,796
 
Net income attributable to GAMCO
                    
Investors, Inc.'s shareholders
  
26,025
   
27,543
   
30,861
   
32,692
   
117,121
 
Net income attributable to GAMCO
                    
Investors, Inc.'s shareholders per share:
                    
Basic
  
0.89
   
0.94
   
1.06
   
1.12
   
4.01
 
Diluted
 
$
0.88
  
$
0.93
  
$
1.03
  
$
1.07
  
$
3.92