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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2013
Components of Income Tax Provision

Components of the income tax provision applicable to federal, state and foreign income taxes for the years ended December 31, 2013, 2012 and 2011 are as follows (in thousands):

 

     2013     2012     2011  

Federal income tax expense (benefit):

      

Current

   $ 41,558      $ (512   $ 16,336   

Deferred

     47,136        156,003        146,842   
  

 

 

   

 

 

   

 

 

 
     88,694        155,491        163,178   
  

 

 

   

 

 

   

 

 

 

State income tax expense:

      

Current

     11,733        12,455        6,056   

Deferred

     4,229        5,483        13,196   
  

 

 

   

 

 

   

 

 

 
     15,962        17,938        19,252   
  

 

 

   

 

 

   

 

 

 

Foreign income tax expense (benefit):

      

Current

     4,572        3,817        6,579   

Deferred

     (796     (1,050     (1,071
  

 

 

   

 

 

   

 

 

 
     3,776        2,767        5,508   
  

 

 

   

 

 

   

 

 

 

Total income tax expense:

      

Current

     57,863        15,760        28,971   

Deferred

     50,569        160,436        158,967   
  

 

 

   

 

 

   

 

 

 

Total income tax expense:

   $ 108,432      $ 176,196      $ 187,938   
  

 

 

   

 

 

   

 

 

 
Difference Between Statutory Federal Income Tax Rate and Effective Income Tax Rate

The difference between the statutory federal income tax rate and the effective income tax rate for the years ended December 31, 2013, 2012 and 2011 is summarized as follows:

 

     2013     2012     2011  

Statutory tax rate

     35.0     35.0     35.0

State income taxes

     3.7        2.5        2.5   

Permanent differences

     (1.5     (0.2     (0.1

Other, net

     (0.6     (0.3     (0.6
  

 

 

   

 

 

   

 

 

 

Effective tax rate

     36.6     37.0     36.8
  

 

 

   

 

 

   

 

 

 
Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities

The tax effect of significant temporary differences representing deferred tax assets and liabilities and changes therein were as follows (in thousands):

 

    December  31,
2013
    Net
Change
    December  31,
2012
    Net
Change
    December  31,
2011
    Net
Change
    December  31,
2010
 

Deferred tax assets:

             

Current:

             

Net operating loss carryforwards

  $      $ (18,914   $ 18,914      $ (95,662   $ 114,576      $ 114,576      $   

Workers’ compensation allowance

    27,612        2,534        25,078        1,074        24,004        714        23,290   

Other

    19,647        (804     20,451        1,651        18,800        146        18,654   
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 
    47,259        (17,184     64,443        (92,937     157,380        115,436        41,944   
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Non-current:

             

Net operating loss carryforwards

    13,452        1,690        11,762        (6,672     18,434        11,969        6,465   

Expense associated with employee stock options

    16,208        1,536        14,672        1,944        12,728        1,476        11,252   

Federal benefit of state deferred tax liabilities

    22,838        816        22,022        1,762        20,260        7,105        13,155   

Other

    14,703        (421     15,124        4,454        10,670        (5,361     16,031   
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 
    67,201        3,621        63,580        1,488        62,092        15,189        46,903   
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Total deferred tax assets

    114,460        (13,563     128,023        (91,449     219,472        130,625        88,847   
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Deferred tax liabilities:

             

Current:

             

Other

    (14,307     (2,823     (11,484     3,171        (14,655     474        (15,129
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Non-current:

             

Property and equipment basis difference

    (939,594     (33,997     (905,597     (69,774     (835,823     (289,168     (546,655

Other

    (15,471     (186     (15,285     (2,384     (12,901     (1,231     (11,670
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 
    (955,065     (34,183     (920,882     (72,158     (848,724     (290,399     (558,325
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Total deferred tax liabilities

    (969,372     (37,006     (932,366     (68,987     (863,379     (289,925     (573,454
 

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 

Net deferred tax liability

  $ (854,912   $ (50,569   $ (804,343   $ (160,436   $ (643,907   $ (159,300   $ (484,607