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Benefit Plans (Tables)
12 Months Ended
Dec. 31, 2011
Benefit Plans [Abstract]  
Combined funded status of the plans and their reconciliation with the related amounts recognized in our consolidated financial statements
                 
  in thousands   2011     2010  
     

  Change in Benefit Obligation

               

  Projected benefit obligation at beginning of year

    $761,384       $709,783  

  Service cost

    20,762       19,217  

  Interest cost

    42,383       41,621  

  Actuarial loss

    81,699       27,094  

  Benefits paid

    (38,854     (36,331

  Projected benefit obligation at end of year

    $867,374       $761,384  
     

  Change in Plan Assets

               

  Fair value of assets at beginning of year

    $630,303       $493,646  

  Actual return on plan assets

    40,293       94,629  

  Employer contribution

    4,906       78,359  

  Benefits paid

    (38,854     (36,331

  Fair value of assets at end of year

    $636,648       $630,303  

  Funded status

    ($230,726     ($131,081

  Net amount recognized

    ($230,726     ($131,081
     

  Amounts Recognized in the Consolidated

               

  Balance Sheets

               

  Noncurrent assets

    $0       $1,083  

  Current liabilities

    (4,880     (5,028

  Noncurrent liabilities

    (225,846     (127,136

  Net amount recognized

    ($230,726     ($131,081
     

  Amounts Recognized in Accumulated

               

  Other Comprehensive Income

               

  Net actuarial loss

    $281,352       $202,135  

  Prior service cost

    597       938  

  Total amount recognized

    $281,949       $203,073  
                 
  in thousands   2011     2010  
     

  Change in Benefit Obligation

               

  Projected benefit obligation at beginning of year

    $133,717       $118,313  

  Service cost

    4,789       4,265  

  Interest cost

    6,450       6,651  

  Actuarial (gain) loss

    (2,854     11,730  

  Benefits paid

    (7,176     (7,242

  Projected benefit obligation at end of year

    $134,926       $133,717  
     

  Change in Plan Assets

               

  Fair value of assets at beginning of year

    $0       $0  

  Actual return on plan assets

    0       0  

  Fair value of assets at end of year

    $0       $0  

  Funded status

    ($134,926     ($133,717

  Net amount recognized

    ($134,926     ($133,717
     

  Amounts Recognized in the
  Consolidated Balance Sheets

               

  Current liabilities

    ($9,966     ($9,100

  Noncurrent liabilities

    (124,960     (124,617

  Net amount recognized

    ($134,926     ($133,717
     

  Amounts Recognized in Accumulated
  Other Comprehensive Income

               

  Net actuarial loss

    $26,006       $30,008  

  Prior service credit

    (4,141     (4,815

  Total amount recognized

    $21,865       $25,193  
Components of net periodic benefit cost, amounts recognized in other comprehensive income and weighted-average assumptions of the plans
      000000000       000000000       000000000  
  dollars in thousands   2011     2010     2009  
       

  Components of Net Periodic Pension
  Benefit Cost

                       

  Service cost

    $20,762       $19,217       $18,638  

  Interest cost

    42,383       41,621       41,941  

  Expected return on plan assets

    (49,480     (50,122     (46,505

  Amortization of prior service cost

    340       460       460  

  Amortization of actuarial loss

    11,670       5,752       1,651  

  Net periodic pension benefit cost

    $25,675       $16,928       $16,185  
       

  Changes in Plan Assets and Benefit
  Obligations Recognized in Other
  Comprehensive Income

                       

  Net actuarial loss (gain)

    $90,886       ($17,413     $27,811  

  Reclassification of actuarial loss to net
  periodic pension benefit cost

    (11,670     (5,752     (1,651

  Reclassification of prior service cost to net
  periodic pension benefit cost

    (340     (460     (460

  Amount recognized in other comprehensive
  income

    $78,876       ($23,625     $25,700  

  Amount recognized in net periodic pension
  benefit cost and other comprehensive
  income

    $104,551       ($6,697     $41,885  
       

  Assumptions

                       

  Weighted-average assumptions used to
  determine net periodic benefit cost for
  years ended December 31

                       

  Discount rate

    5.49     5.92     6.60

  Expected return on plan assets

    8.00     8.25     8.25

  Rate of compensation increase

                       

  (for salary-related plans)

    3.50     3.40     4.75
       

  Weighted-average assumptions used to
  determine benefit obligation at
  December 31

                       

  Discount rate

    4.96     5.49     5.92

  Rate of compensation increase
  (for salary-related plans)

    3.50     3.50     3.40
                         

  dollars in thousands

    2011       2010       2009  
       

  Components of Net Periodic Postretirement
  Benefit Cost

                       

  Service cost

    $4,789       $4,265       $3,912  

  Interest cost

    6,450       6,651       7,045  

  Amortization of prior service credit

    (674     (728     (823

  Amortization of actuarial loss

    1,149       887       598  

  Net periodic postretirement benefit cost

    $11,714       $11,075       $10,732  
       

  Changes in Plan Assets and Benefit
  Obligations Recognized in Other
  Comprehensive Income

                       

  Net actuarial (gain) loss

    ($2,853     $11,730       $974  

  Reclassification of actuarial loss to net
  periodic postretirement benefit cost

    (1,149     (887     (598

  Reclassification of prior service credit to net
  periodic postretirement benefit cost

    674       728       823  

  Amount recognized in other comprehensive
  income

    ($3,328     $11,571       $1,199  

  Amount recognized in net periodic
  postretirement benefit cost and other comprehensive income

    $8,386       $22,646       $11,931  
       

  Assumptions
  Assumed Healthcare Cost Trend Rates
  at December 31

                       

  Healthcare cost trend rate assumed
  for next year

    7.50%       8.00%       8.50%  

  Rate to which the cost trend rate gradually
  declines

    5.00%       5.00%       5.00%  

  Year that the rate reaches the rate it is
  assumed to maintain

    2017       2017       2017  
       

  Weighted-average assumptions used to
  determine net periodic benefit cost for
  years ended December 31

                       

  Discount rate

    4.95%       5.45%       6.65%  
       

  Weighted-average assumptions used to
  determine benefit obligation at
  December 31

                       

  Discount rate

    4.60%       4.95%       5.45%  
Fair values of pension plan assets
      000000000       000000000       000000000       000000000  
  in thousands   Level 1  1     Level 2 1     Level 3 1     Total  
         

  Asset Category

                               

  Debt securities

    $0       $152,240       $0       $152,240  

  Investment funds

                               

  Commodity funds

    0       26,498       0       26,498  

  Equity funds

    884       346,632       0       347,516  

  Short-term funds

    3,593       0       0       3,593  

  Venture capital and partnerships

    0       0       106,801       106,801  

  Total pension plan assets

    $4,477       $525,370       $106,801       $636,648  

1 See Note 1 under the caption Fair Value Measurements for a description of the fair value hierarchy.

FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2010

 

      000000000       000000000       000000000       000000000  
  in thousands   Level 1  1     Level 2 1     Level 3  1     Total  
         

  Asset Category

                               

  Debt securities

    $0       $127,193       $308       $127,501  

  Investment funds

                               

  Commodity funds

    0       29,270       0       29,270  

  Equity funds

    128       361,190       0       361,318  

  Short-term funds

    2       15,965       0       15,967  

  Venture capital and partnerships

    0       0       96,244       96,244  

  Other

    0       3       0       3  

  Total pension plan assets

    $130       $533,621       $96,552       $630,303  

1 See Note 1 under the caption Fair Value Measurements for a description of the fair value hierarchy.

Reconciliation of the fair value measurements using significant unobservable inputs (Level 3)

FAIR VALUE MEASUREMENTS

USING SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)

 

                         
  in thousands   Debt
Securities
    Venture
Capital and
Partnerships
    Total  

  Balance at December 31, 2009

    $320       $93,262       $93,582  

  Actual return on plan assets

                       

  Relating to assets still held at December 31, 2010

    1       4,727       4,728  

  Relating to assets sold during the year ended
  December 31, 2010

    0       0       0  

  Purchases, sales and settlements, net

    (13     (1,745     (1,758

  Transfers in (out) of Level 3

    0       0       0  

  Balance at December 31, 2010

    $308       $96,244       $96,552  

  Actual return on plan assets

                       

  Relating to assets still held at December 31, 2011

    0       13,696       13,696  

  Relating to assets sold during the year ended
  December 31, 2011

    0       0       0  

  Purchases, sales and settlements, net

    0       (3,139     (3,139

  Transfers in (out) of Level 3

    (308     0       (308

  Balance at December 31, 2011

    $0       $106,801       $106,801  
Employer contributions for the plans
         
  in thousands   Pension  
   

  Employer Contributions

       

  2009

  $ 27,616  

  2010

    78,359  

  2011

    4,906  

  2012 (estimated)

    4,880  
         
  in thousands   Postretirement  
   

  Employer Contributions

       

  2009

    $6,455  

  2010

    7,242  

  2011

    7,176  

  2012 (estimated)

    9,966  
Estimated Future Benefit Payments
         
  in thousands   Pension  

 

  Estimated Future Benefit Payments

       

  2012

    $42,048  

  2013

    41,488  

  2014

    50,147  

  2015

    48,123  

  2016

    50,085  

  2017-2021

    275,298  
         
  in thousands   Postretirement  
   

  Estimated Future Benefit Payments

       

  2012

    $9,966  

  2013

    10,344  

  2014

    10,783  

  2015

    11,048  

  2016

    11,379  

  2017–2021

    61,962  
Summary of each multiemployer pension plan
                                             

    Pension

    Fund

 

EIN/Pension

Plan Number

      

Pension
Protection

Act Zone Status 1

 

FIP/RP

Status

Pending/

Implemented

       Vulcan Contributions in thousands  

Surcharge

Imposed

 

Expiration

Date/Range of

CBAs

      2011   2010       2011       2010   2009    
A   36-6042061-001       orange   orange   no       $162       $176   $203   no   5/31/2013
                                            1/31/2012 -
B   36-6052390-001       green   green   no       408       494   436   no   1/31/2013
                                             
                                            5/30/2012 -
C   36-6044243-001       red   red   no       276       267   213   no   6/30/2014
                       
D   51-6031295-002       green   green   no       52       49   62   no   3/31/2014
                       
E   94-6277608-001       yellow   yellow   yes       177       176   181   no   7/15/2013
                                             
                                            9/30/2012 -
F   52-6074345-001       red   red   yes       840       825   801   no   7/31/2014
                       
G   51-6067400-001       green   green   no       166       181   169   no   4/30/2014
                                             
                                            9/30/2011 -
H   36-6140097-001       green   green   no       1,543       1,566   1,553   no   4/30/2014
                                             
                                            7/15/2013 -
I   94-6090764-001       orange   orange   yes       1,737       1,576   1,641   no   9/17/2013
                       
J   95-6032478-001       red   red   yes       313       243   292   no   9/30/2015
                       
K   36-6155778-001       red   red   yes       198       195   198   no   4/30/2013
                       
    L 2   51-6051034-001       green   green   no       24       54   49   no   1/31/2013
                                             
                                            1/15/2012 -
M   91-6145047-001       green   green   no       882       764   929   no   9/30/2014

Total contributions

                              $6,778        $6,566   $6,727        
     
   

A      Automobile Mechanics Local No. 701 Pension Fund

 

H     Midwest Operating Engineers Pension Trust Fund

B      Central Pension Fund of the IUOE and Participating Employers

 

I       Operating Engineers Trust Funds - Local 3

C      Central States Southeast and Southwest Areas Pension Plan

 

J      Operating Engineers Pension Trust Funds - Local 12

D     IAM National Pension Fund

 

K      Suburban Teamsters of Northern Illinois Pension Plan

E      Laborers Trust Funds for Northern California

 

L      Teamsters Union No 142 Pension Trust Fund

F      LIUNA National Industrial Pension Fund

 

M     Western Conference of Teamsters Pension Trust Fund

G     Local 786 Building Material Pension Trust

   

 

 1

The Pension Protection Act of 2006 defines the zone status as follows: green - healthy, yellow - endangered, orange - seriously endangered and red - critical.

 

 2

All employees covered under this plan were located at operations divested on 9/30/2011.

Unfunded, nonqualified pension plans
      $000,000000       $000,000000  
  in thousands   2011     2010  
     

  Unfunded, nonqualified pension plans

               

  Projected benefit obligation

    $83,025       $77,400  

  Accumulated benefit obligation

    76,795       72,000  

  Fair value of assets

    0       0  
Effect of a one-percentage-point change in the assumed healthcare cost trend rate
                 
  in thousands   One-percentage-point
Increase
    One-percentage-point
Decrease
 
     

  Effect on total of service and interest cost

    $1,326       ($1,146

  Effect on postretirement benefit obligation

    12,043       (10,653
Contributions by participants to the postretirement benefit plans
         
  in thousands   Postretirement  
   

  Participants Contributions

       

  2009

    $1,673  

  2010

    1,829  

  2011

    1,933