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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2012
Income Taxes  
Schedule of components of income tax expense (benefit)

Components of income tax expense (benefit) consist of the following (in thousands):

 
  Year Ended December 31,  
 
  2012   2011   2010  

Current:

                   

Federal

  $ 83,905   $ 54,132   $ 25,046  

State

    13,949     8,948     1,792  

Foreign

    659     544     846  
               

Total current

    98,513     63,624     27,684  

Deferred

                   

Federal

    37,259     11,228     (1,614 )

State

    (415 )   (2,428 )   1,881  

Foreign

    182     641     (1,289 )
               

Total deferred

    37,026     9,441     (1,022 )
               

Other non-current

                   

Federal

    573     7,605     15,672  

State

    114     1,621     1,068  

Foreign

    3     (417 )   543  
               

Total other

    690     8,809     17,283  
               

Total income tax expense

  $ 136,229   $ 81,874   $ 43,945  
               
Schedule of reconciliation of income taxes computed at the statutory federal tax rate to income tax expense (benefit)

Presented below is a reconciliation of income taxes computed at the statutory federal tax rate to income tax expense (benefit) as reported (in thousands):

 
  Year Ended December 31,  
 
  2012   2011   2010  

Federal tax provision computed at 35%

  $ 154,235   $ 105,018   $ 54,302  

State tax provision, net of federal tax provision

    9,149     5,549     1,437  

General business credits

    (10,980 )   (15,776 )   (14,759 )

Incentive stock option expense

    (479 )   (290 )   (1,201 )

Section 199 deduction

    (15,629 )   (8,091 )   (3,627 )

Nondeductible compensation expense

    2,609     (2,607 )   7,342  

Nondeductible expenses

    (2,676 )   (1,929 )   451  
               

Total income tax expense

  $ 136,229   $ 81,874   $ 43,945  
               
Schedule of components of net deferred tax asset

Components of the net deferred tax asset are as follows (in thousands):

 
  December 31,  
 
  2012   2011  

Deferred tax assets:

             

General business credits

  $ 25,834   $ 72,188  

Impairment losses on investments

    2,884     2,892  

Realized losses on marketable investments

    2,095     2,101  

License fees capitalized for tax purposes

    74,964     69,720  

Nonqualified stock options

    30,872     31,463  

SERP

    14,594     12,164  

STAP awards

    20,238     21,502  

Other

    31,534     22,015  
           

Total deferred tax assets

    203,015     234,045  

Deferred tax liabilities:

             

Plant and equipment principally due to differences in depreciation

    (31,428 )   (28,416 )

Other

    (1,221 )   (1,227 )
           

Net deferred tax asset before valuation allowance

    170,366     204,402  

Valuation allowance

    (5,665 )   (5,458 )
           

Net deferred tax assets

  $ 164,701   $ 198,944  
           
Schedule of reconciliation of beginning and ending balances of unrecognized tax benefit

A reconciliation of the beginning and ending balances of unrecognized tax benefits for the years indicated is as follows (in thousands):

Unrecognized tax benefits at January 1, 2012

  $ 1,733  

Gross increases—tax positions in prior period

    146  

Gross decreases—tax positions in prior period

    (368 )

Gross increases—tax positions in the current period

     

Gross decreases—tax positions in current period

     

Settlements

     

Lapse of statute of limitations

     
       

Unrecognized tax benefits at December 31, 2012

  $ 1,511  
       

Unrecognized tax benefits at January 1, 2011

  $ 7,406  

Gross increases—tax positions in prior period

    500  

Gross decreases—tax positions in prior period

    (7,406 )

Gross increases—tax positions in the current period

    1,233  

Gross decreases—tax positions in the current period

     

Settlements

     

Lapse of statute of limitations

     
       

Unrecognized tax benefits at December 31, 2011

  $ 1,733  
       

Unrecognized tax benefits at January 1, 2010

  $ 6,736  

Gross increases—tax positions in prior period

    670  

Gross decreases—tax positions in prior period

     

Gross increases—tax positions in the current period

     

Gross decreases—tax positions in the current period

     

Settlements

     

Lapse of statute of limitations

     
       

Unrecognized tax benefits at December 31, 2010

  $ 7,406