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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2013
Income Taxes [Abstract]  
Reconciliation of Provision for Income Taxes
The following is a reconciliation of the provision for income taxes computed at federal statutory rates to the effective rates:
 
      For the three months ended
      March 31,
     
2013
     
2012
 
                 
Consolidated tax provision at federal statutory rate
   
35.0%
     
35.0%
 
State income tax provisions, net of federal income
               
    tax benefit
   
        3.6
     
        2.8
 
Noncontrolling interest
   
      (0.4)
     
      (0.9)
 
Tax reserve adjustment
   
        0.4
     
        1.2
 
All other, net
   
        1.0
     
      (0.1)
 
Effective tax rate
   
39.6%
     
38.0%