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Other Noncurrent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2012
Other Noncurrent Liabilities

Other noncurrent liabilities consist of the following at December 31, 2012 and 2011 (in thousands):

 

     December 31,  
     2012      2011  

Liabilities related to uncertain tax positions(a)

    $ 29,179       $ 30,677   

Executive deferred compensation plan obligation

      20,265         16,786   

Deferred revenue—long-term

      3,362         11,412   

Environmental liabilities(b)

      17,213         10,926   

Asset retirement obligations(b)

      16,517         14,865   

Other

      27,486         26,441   
  

 

 

     

 

 

  

Total

    $ 114,022       $ 111,107   
  

 

 

     

 

 

  

 

(a) See Note 18, “Income Taxes.”
(b) See Note 15, “Commitments and Contingencies.”