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Summarized Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2012
Summarized Quarterly Financial Data [Abstract]  
Summarized Quarterly Financial Data (Unaudited)
14.
Summarized Quarterly Financial Data (Unaudited)
 
Quarterly financial information for 2011 and 2012 is as follows (in thousands except per share data):
 
   
Quarter
  
2011
  
First
    
Second
    
Third
    
Fourth
  
Revenues
   $ 171,956     $ 163,789     $ 135,865     $ 155,824  
Income from operations
     59,225       50,145       24,405       45,369  
Net income
     35,791       29,647       13,935       26,671  
Net income per share:
                                
Basic
   $ 2.81     $ 2.54     $ 1.20     $ 2.31  
Diluted
   $ 2.80     $ 2.53     $ 1.20     $ 2.30  
 
   
Quarter
  
2012
  
First
    
Second
    
Third
    
Fourth
  
Revenues
   $ 149,532     $ 146,254     $ 124,260     $ 141,933  
Income from operations
     40,858       36,168       7,836       28,725  
Net income
     23,989       21,212       4,103       16,627  
Net income per share:
                                
Basic
   $ 2.10     $ 1.86     $ 0.36     $ 1.47  
Diluted
   $ 2.09     $ 1.85     $ 0.36     $ 1.47