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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2011
Income Taxes [Abstract]  
Schedule Of Effective Income Tax Rate Reconciliation
     Years Ended December 31,  
     2011     2010     2009  

U.S. federal statutory rate

     35.0     35.0     35.0

State taxes, net of federal benefit

     3.0        2.5        2.6   

Nondeductible expenses

     0.6        1.1        0.5   

Provision for valuation allowance

     (0.3     —          0.4   

State law change

     (0.2     (0.3     0.4   

Other

     0.2        (0.3     (0.2
  

 

 

   

 

 

   

 

 

 

Net effective rate

     38.3     38.0     38.7
  

 

 

   

 

 

   

 

 

 
Summary Of Provision For Income Taxes
     Years Ended December 31,  
     2011     2010     2009  

Current

      

Federal

   $ 14,356      $ 14,959      $ 14,700   

State and local

     3,230        2,303        1,619   

Foreign

     32        47        —     
  

 

 

   

 

 

   

 

 

 
     17,618        17,309        16,319   
  

 

 

   

 

 

   

 

 

 

Deferred

      

Federal

     18,146        9,411        4,560   

State and local

     365        (85     741   

Foreign

     (10     —          —     
  

 

 

   

 

 

   

 

 

 
     18,501        9,326        5,301   
  

 

 

   

 

 

   

 

 

 

Total provision

   $ 36,119      $ 26,635      $ 21,620   
  

 

 

   

 

 

   

 

 

 
Summary Of Deferred Tax Assets And Liabilities
     December 31,  
     2011     2010  

Reserve for uncollectible accounts receivable

   $ 1,379      $ 1,363   

Accrued compensation

     6,342        4,217   

Other reserves

     3,154        2,618   
  

 

 

   

 

 

 

Current deferred tax assets

     10,875        8,198   

Accrued compensation

     4,670        4,376   

Other reserves

     966        1,020   

Operating loss carryforwards

     581        415   

Income tax basis in excess of financial basis of goodwill

     —          150   

Less valuation allowance

     (108     (379
  

 

 

   

 

 

 

Non-current deferred tax assets

     6,109        5,582   
  

 

 

   

 

 

 

Total deferred tax assets

   $ 16,984      $ 13,780   
  

 

 

   

 

 

 

Prepaids

   $ (1,939   $ (1,614

Other receivables

     (4,098     (3,270
  

 

 

   

 

 

 

Current deferred tax liabilities

     (6,037     (4,884

Property and equipment

     (27,457     (12,332

Goodwill

     (70,416     (64,989
  

 

 

   

 

 

 

Non-current deferred tax liabilities

     (97,873     (77,321
  

 

 

   

 

 

 

Total deferred tax liabilities

   $ (103,910   $ (82,205
  

 

 

   

 

 

 
Schedule Of Unrecognized Tax Benefits

Balance at December 31, 2009

   $ 518   

Additions based on tax positions related to the current year

         239   

Reductions as a result of a lapse of the applicable statute of limitations

     (102
  

 

 

 

Balance at December 31, 2010

   $ 655   

Additions for tax positions taken in prior years

     200   

Reductions as a result of a lapse of the applicable statute of limitations

     (99
  

 

 

 

Balance at December 31, 2011

   $ 756