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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract]  
Depreciation, depletion, accretion and amortization expense
                         
  in thousands   2011     2010     2009  
       

  Depreciation, Depletion, Accretion and Amortization

                       

  Depreciation

        $328,072           $349,460           $361,530  

  Depletion

    11,195       10,337       10,143  

  Accretion

    8,195       8,641       8,802  

  Amortization of leaseholds and
  capitalized leases

    225       195       180  

  Amortization of intangibles

    14,032       13,460       13,957  

  Total

    $361,719       $382,093       $394,612  
Fair value measurement of assets on a recurring basis
                 
     Level 1  
  in thousands   2011     2010  

  Fair Value Recurring

               

  Rabbi Trust

               

  Mutual funds

    $13,536       $13,960  

  Equities

    7,057       9,336  

  Total

    $20,593       $23,296  
     
                 
     Level 2  
  in thousands   2011     2010  

  Fair Value Recurring

               

  Rabbi Trust

               

  Common/collective trust funds

    $2,192       $2,431  

  Total

    $2,192       $2,431  
Fair value measurement of assets on a nonrecurring basis
                 
     2010  
  in thousands   Level 3     Impairment
Charges
 

  Fair Value Nonrecurring

               

  Property, plant & equipment

    $1,536       $2,500  

  Assets held for sale

    9,625       1,436  

  Totals

    $11,161       $3,936  
Summary of company owned life insurance cash surrender value, loans outstanding and net values included in other noncurrent assets
                 
  in thousands   2011     2010  

  Company Owned Life Insurance

               

  Cash surrender value

    $38,300       $35,421  

  Loans outstanding

    38,289       35,410  

  Net value included in noncurrent assets

    $11       $11  
Summary of estimated future compensation cost related to share-based awards granted to employees under long-term incentive plans
                 
dollars in thousands   Unrecognized
Compensation
Expense
    Expected
Weighted-average
Recognition (Years)
 
     

Share-based Compensation

               

SOSARs 1

    $5,857       1.6  

Performance shares

    11,130       2.6  

Total/weighted-average

    $16,987       2.3  
Pretax compensation expense related to employee share-based compensation awards and related income tax benefits
                         
in thousands   2011     2010     2009  
       

Employee Share-based Compensation Awards

                       

Pretax compensation expense

    $17,537       $19,746       $21,861  

Income tax benefits

    6,976       7,968       8,915  
Liabilities under self-insurance program
                 
  dollars in thousands   2011     2010  
     

  Self-insurance Program

               

  Liabilities (undiscounted)

    $46,178       $70,174  

  Discount rate

    0.65%       1.01%  

  Amounts Recognized in Consolidated

               

  Balance Sheets

               

  Other accrued liabilities

    $13,046       $36,699  

  Other noncurrent liabilities

    32,089       31,990  

  Accrued liabilities (discounted)

    $45,135       $68,689  
Estimated payments (undiscounted) under our self-insurance program
         
  in thousands       
   

  Estimated Payments under Self-insurance Program

       

  2012

    $14,382    

  2013

    8,371    

  2014

    5,703    

  2015

    3,856    

  2016

    2,737    
Weighted-average common shares outstanding
                         
  in thousands   2011     2010     2009  

  Weighted-average common shares outstanding

        129,381           128,050           118,891  

  Dilutive effect of

                       

  Stock options/SOSARs

    0       0       269  

  Other stock compensation plans

    0       0       270  

  Weighted-average common shares outstanding,
  assuming dilution

    129,381       128,050       119,430  
Antidilutive common stock equivalents
                         
  in thousands   2011     2010     2009  

  Antidilutive common stock equivalents

            5,845               5,827               3,661