Quarterly Information (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2012
Quarterly Information [Abstract]  
Summary of quarterly financial data for the periods
                                 
    Three Months Ended  
    March 31     June 30     September 30     December 31  

2012

                               

Gross collections

  $ 231,028     $ 240,560     $ 245,977     $ 230,490  

Revenues

    126,405       141,063       144,792       143,612  

Total operating expenses

    91,394       102,809       103,621       103,872  

Income from continuing operations, net of tax

    18,108       18,988       21,308       20,167  

Loss from discontinued operations, net of tax

    (6,702     (2,392     —         —    

Net income

    11,406       16,596       21,308       20,167  

Basic earnings (loss) per share from:

                               

Continuing operations

  $ 0.73     $ 0.76     $ 0.85     $ 0.82  

Discontinued operations

  $ (0.27   $ (0.09   $ 0.00     $ 0.00  
   

 

 

   

 

 

   

 

 

   

 

 

 

Net basic earnings per share

  $ 0.46     $ 0.67     $ 0.85     $ 0.82  
   

 

 

   

 

 

   

 

 

   

 

 

 

Diluted earnings (loss) per share from:

                               

Continuing operations

  $ 0.70     $ 0.74     $ 0.82     $ 0.79  

Discontinued operations

  $ (0.26   $ (0.10   $ 0.00     $ 0.00  
   

 

 

   

 

 

   

 

 

   

 

 

 

Net diluted earnings per share

  $ 0.44     $ 0.64     $ 0.82     $ 0.79  
   

 

 

   

 

 

   

 

 

   

 

 

 
         

2011

                               

Gross collections

  $ 191,073     $ 195,081     $ 189,058     $ 185,946  

Revenues

    105,326       111,093       115,843       116,452  

Total operating expenses

    78,227       81,518       85,182       83,639  

Income from continuing operations, net of tax

    13,282       14,766       15,310       17,235  

Income (loss) from discontinued operations, net of tax

    397       9       60       (101

Net income

    13,679       14,775       15,370       17,134  

Basic earnings (loss) per share from:

                               

Continuing operations

  $ 0.55     $ 0.60     $ 0.62     $ 0.70  

Discontinued operations

  $ 0.01     $ 0.00     $ 0.00     $ (0.01
   

 

 

   

 

 

   

 

 

   

 

 

 

Net basic earnings per share

  $ 0.56     $ 0.60     $ 0.62     $ 0.69  
   

 

 

   

 

 

   

 

 

   

 

 

 

Diluted earnings per share from:

                               

Continuing operations

  $ 0.52     $ 0.58     $ 0.60     $ 0.67  

Discontinued operations

  $ 0.02     $ 0.00     $ 0.00     $ 0.00  
   

 

 

   

 

 

   

 

 

   

 

 

 

Net diluted earnings per share

  $ 0.54     $ 0.58     $ 0.60     $ 0.67