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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 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  For the six months ended 
      June 30,      June 30,
     
2013
     
2012
     
2013
 
2012
                           
Consolidated tax provision at federal statutory rate
   
35.0%
     
35.0%
     
35.0%
 
35.0%
State income tax provisions, net of federal income
                         
    tax benefit
   
        9.2
     
        3.1
     
      (8.2)
 
          2.8
Noncontrolling interest
   
      (0.6)
     
      (1.4)
     
          -
 
        (1.1)
Tax reserve adjustment
   
        7.7
     
      (2.1)
     
    (15.4)
 
        (0.2)
Changes in certain deferred tax balances
   
    (10.6)
     
          -
     
      22.6
 
            -
IRS audit adjustments
   
      (9.0)
     
          -
     
      19.3
 
            -
All other, net
   
        1.1
     
        0.2
     
        0.8
 
          0.2
Effective tax rate
   
32.8%
     
34.8%
     
54.1%
 
36.7%