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RETIREMENT BENEFITS (Tables) | 12 Months Ended
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Dec. 31, 2011
Changes in Benefit Obligations and Plan Assets as Well as Funded Status of Retirement Plans | The changes in benefit obligations and plan assets as well as the funded status of our retirement plans at December 31 are as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
|  | (Dollars in thousands) |
Change in benefit obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligation at beginning of year |  | $ | 541,443 |  |  | $ | 491,642 |  |  | $ | 54,452 |  |  | $ | 51,170 |
Service cost |  |  | 13,857 |  |  |  | 13,428 |  |  |  | 862 |  |  |  | 918 |
Interest cost |  |  | 28,519 |  |  |  | 28,200 |  |  |  | 2,441 |  |  |  | 2,782 |
Actuarial losses (gains) |  |  | 52,417 |  |  |  | 35,243 |  |  |  | (703 | ) |  |  | 3,566 |
Plan amendments |  |  | (144 | ) |  |  | 125 |  |  |  | (408 | ) |  |  | — |
Benefits paid |  |  | (24,973 | ) |  |  | (23,515 | ) |  |  | (4,436 | ) |  |  | (4,887 | )
Curtailment gain |  |  | (449 | ) |  |  | — |  |  |  | (1,909 | ) |  |  | — |
Participants’ contributions |  |  | — |  |  |  | — |  |  |  | 832 |  |  |  | 903 |
Foreign currency exchange rate changes |  |  | (932 | ) |  |  | (3,680 | ) |  |  | — |  |  |  | — |
Obligation at end of year |  |  | 609,738 |  |  |  | 541,443 |  |  |  | 51,131 |  |  |  | 54,452 |
Change in plan assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  |  | 494,181 |  |  |  | 362,793 |  |  |  | — |  |  |  | — |
Actual return on plan assets |  |  | 39,782 |  |  |  | 61,844 |  |  |  | — |  |  |  | — |
Employer contributions |  |  | 887 |  |  |  | 93,059 |  |  |  | 3,604 |  |  |  | 3,984 |
Participants’ contributions |  |  | — |  |  |  | — |  |  |  | 832 |  |  |  | 903 |
Benefits paid |  |  | (24,973 | ) |  |  | (23,515 | ) |  |  | (4,436 | ) |  |  | (4,887 | )
Fair value of plan assets at end of year |  |  | 509,877 |  |  |  | 494,181 |  |  |  | — |  |  |  | — |
Funded status |  | $ | (99,861 | ) |  | $ | (47,262 | ) |  | $ | (51,131 | ) |  | $ | (54,452 | )
Amounts recognized in the consolidated balance sheets |  |  |  |  |  |  |  |  |  |  |  |
Non-current asset |  | $ | — |  |  | $ | 2,487 |  |  | $ | — |  |  | $ | — |
Current liabilities |  |  | (916 | ) |  |  | (839 | ) |  |  | (4,311 | ) |  |  | (4,629 | )
Non-current liabilities |  |  | (98,945 | ) |  |  | (48,910 | ) |  |  | (46,820 | ) |  |  | (49,823 | )
Net amount recognized |  | $ | (99,861 | ) |  | $ | (47,262 | ) |  | $ | (51,131 | ) |  | $ | (54,452 | )
Amounts recognized in accumulated other comprehensive (loss) income |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss |  | $ | 166,722 |  |  | $ | 121,334 |  |  | $ | 6,304 |  |  | $ | 9,254 |
Prior service cost (credit) |  |  | 6,203 |  |  |  | 9,170 |  |  |  | (17,688 | ) |  |  | (19,864 | )
Net amount recognized |  | $ | 172,925 |  |  | $ | 130,504 |  |  | $ | (11,384 | ) |  | $ | (10,610 | )
Items to be Recognized in 2012 as a Component of Net Periodic Cost |
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | (Dollars in thousands) |
Items to be recognized in 2012 as a component of net periodic cost |  |  |  |  |  |  |  |
Net actuarial loss |  | $ | 12,351 |  |  | $ | 278 |
Prior service cost (credit) |  |  | 1,906 |  |  |  | (2,616 | )
Net periodic cost (credit) to be recorded in 2012 |  | $ | 14,257 |  |  | $ | (2,338 | )
Benefits Expected to Be Paid from Pension and Other Postretirement Benefit Plans, Which Reflect Future Years of Services and Medicare Subsidy Expected to Be Received | The benefits expected to be paid from our pension and other postretirement benefit plans, which reflect future years of services and the Medicare subsidy expected to be received, are as follows (dollars in thousands):
|  | Pension Benefits |  |  | Other Postretirement Benefits |
2012 |  | $ | 27,363 |  |  | $ | 4,311 |
2013 |  |  | 28,769 |  |  |  | 4,380 |
2014 |  |  | 30,096 |  |  |  | 4,157 |
2015 |  |  | 31,480 |  |  |  | 3,837 |
2016 |  |  | 32,616 |  |  |  | 3,772 |
2017 — 2021 |  |  | 180,587 |  |  |  | 17,529 |
|  | $ | 330,911 |  |  | $ | 37,986 |
Components of Net Periodic Benefit Cost | The components of the net periodic benefit cost for each of the years ended December 31 are as follows:
|  | Pension Benefits |  |  | Other Postretirement Benefits |
|  | 2011 |  |  | 2010 |  |  | 2009 |  |  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (Dollars in thousands) |
Service cost |  | $ | 13,857 |  |  | $ | 13,428 |  |  | $ | 13,634 |  |  | $ | 862 |  |  | $ | 918 |  |  | $ | 781 |
Interest cost |  |  | 28,519 |  |  |  | 28,200 |  |  |  | 27,657 |  |  |  | 2,441 |  |  |  | 2,782 |  |  |  | 2,916 |
Expected return on plan assets |  |  | (40,817 | ) |  |  | (35,524 | ) |  |  | (25,254 | ) |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service cost (credit) |  |  | 2,042 |  |  |  | 2,065 |  |  |  | 2,221 |  |  |  | (2,582 | ) |  |  | (2,567 | ) |  |  | (2,564 | )
Amortization of actuarial losses |  |  | 8,171 |  |  |  | 8,400 |  |  |  | 9,410 |  |  |  | 134 |  |  |  | 287 |  |  |  | 182 |
Net curtailment gain |  |  | (449 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit cost |  | $ | 11,323 |  |  | $ | 16,569 |  |  | $ | 27,668 |  |  | $ | 855 |  |  | $ | 1,420 |  |  | $ | 1,315 |
Effect of a One Percentage Point Change in Assumed Health Care Cost Trend Rates | A one percentage point change in the assumed health care cost trend rates would have the following effects:
|  | 1-Percentage Point Increase |  |  | 1-Percentage Point Decrease |
|  | (Dollars in thousands) |
Effect on service and interest cost |  | $ | 138 |  |  | $ | (118 | )
Effect on postretirement benefit obligation |  |  | 1,740 |  |  |  | (1,524 | )
Multiemployer pension plans | Further information on these multiemployer plans for the years ended December 31, 2011, 2010 and 2009 is as follows:
|  |  |  |  | Pension Protection Act Zone Status |  |  | FIP / RP Status Pending / Implemented |  |  | Contributions |  |  |  |  |  | Expiration Dates of Collective Bargaining Agreements |
Pension Fund |  | EIN/Pension Plan Number |  |  | 2011 |  |  | 2010 |  |  |  | 2011 |  |  | 2010 |  |  | 2009 |  |  | Surcharge Imposed |  |
|  |  |  |  |  |  |  |  |  |  |  |  |  | (Dollars in thousands) |  |  |  |  |  |  |
Central States, Southeast & Southwest Areas Pension Fund |  |  | 36-6044243/001 |  |  |  | Red |  |  |  | Red |  |  |  | Implemented |  |  | $ | 1,724 |  |  | $ | 1,848 |  |  | $ | 1,775 |  |  |  | No |  |  |  | 4/30/2013, 12/31/2013, 8/31/2014 |
United Food & Commercial Workers – Local 1 Pension Fund |  |  | 16-6144007/001 |  |  |  | Red |  |  |  | Red |  |  |  | Pending |  |  |  | 107 |  |  |  | 102 |  |  |  | 102 |  |  |  | No |  |  |  | 12/31/2011 |
All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,196 |  |  |  | 4,175 |  |  |  | 4,152 |  |  |  |  |  |  |  |  |
Total Contributions |  |  | $ | 6,027 |  |  | $ | 6,125 |  |  | $ | 6,029 |  |  |  |  |  |  |  |  |
Weighted Average Asset Allocation for Pension Plans and Target Allocation | The weighted average asset allocation for our pension plans at December 31, 2011 and 2010 and target allocation for 2011 was as follows:
|  | Target |  |  | Actual Allocation |
|  | Allocation |  |  | 2011 |  |  | 2010 |
Equity securities—U.S. |  |  | 49% |  |  |  | 47% |  |  |  | 52% |
Equity securities—International |  |  | 9% |  |  |  | 10% |  |  |  | 10% |
Debt securities |  |  | 42% |  |  |  | 42% |  |  |  | 37% |
Cash and cash equivalents |  |  | 0% |  |  |  | 1% |  |  |  | 1% |
|  |  | 100% |  |  |  | 100% |  |  |  | 100% |
Fair Value of Plan Assets by Asset Category | The fair value of our plan assets by asset category consisted of the following at December 31:
|  | 2011 |  |  | 2010 |
|  | (Dollars in thousands) |
Equity securities—U.S. |  | $ | 239,076 |  |  | $ | 256,524 |
Equity securities—International |  |  | 50,599 |  |  |  | 51,715 |
Debt securities |  |  | 216,156 |  |  |  | 182,519 |
Cash and cash equivalents |  |  | 4,046 |  |  |  | 3,423 |
|  | $ | 509,877 |  |  | $ | 494,181 |
Benefit Obligations |
Weighted Average Actuarial Assumptions | Our principal domestic pension and other postretirement benefit plans used the following weighted average actuarial assumptions to determine the benefit obligations at December 31:
|  | 2011 |  |  | 2010 |
Discount rate |  |  | 4.6 | % |  |  | 5.4 | %
Expected return on plan assets |  |  | 8.5 | % |  |  | 8.5 | %
Rate of compensation increase |  |  | 3.1 | % |  |  | 3.2 | %
Health care cost trend rate: |  |  |  |  |  |  |  |
Assumed for next year |  |  | 7.8 | % |  |  | 8.0 | %
Ultimate rate |  |  | 5.0 | % |  |  | 4.5 | %
Year that the ultimate rate is reached |  |  | 2045 |  |  |  | 2027 |
Benefit Costs |
Weighted Average Actuarial Assumptions | Our principal domestic pension and other postretirement benefit plans used the following weighted average actuarial assumptions to determine net periodic benefit cost for the years ended December 31:
|  | 2011 |  |  | 2010 |  |  | 2009 |
Discount rate |  |  | 5.4 | % |  |  | 5.9 | % |  |  | 6.3 | %
Expected return on plan assets |  |  | 8.5 | % |  |  | 8.5 | % |  |  | 8.5 | %
Rate of compensation increase |  |  | 3.2 | % |  |  | 3.4 | % |  |  | 3.4 | %
Health care cost trend rate |  |  | 8.0 | % |  |  | 8.0 | % |  |  | 7.9 | %

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2417-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 7, 16, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2410-114920 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6930749&loc=d3e4179-114921 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2439-114920 + Details
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