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Employee Benefit Plans And Other Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2011
Employee Benefit Plans And Other Postretirement Benefits [Abstract] |
Components Of Net Periodic Benefit Costs |
|  | Pension Plans |  |  | Postretirement Plans |
|  | 2011 |  |  | 2010 |  |  | 2009 |  |  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (In thousands) |
Change in Benefit Obligation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of period |  | $ | 246,985 |  |  | $ | 203,292 |  |  | $ | 178,455 |  |  | $ | 23,215 |  |  | $ | 20,080 |  |  | $ | 17,300 |
Service cost |  |  | 19,808 |  |  |  | 18,315 |  |  |  | 17,955 |  |  |  | 1,599 |  |  |  | 1,399 |  |  |  | 1,341 |
Interest cost |  |  | 13,473 |  |  |  | 12,091 |  |  |  | 10,208 |  |  |  | 1,189 |  |  |  | 1,130 |  |  |  | 1,022 |
Plan amendments |  |  | 1,827 |  |  |  | 837 |  |  |  | 7,168 |  |  |  | — |  |  |  | — |  |  |  | — |
Actuarial loss |  |  | 35,399 |  |  |  | 15,153 |  |  |  | 701 |  |  |  | 755 |  |  |  | 1,931 |  |  |  | 987 |
Participant contributions |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 942 |  |  |  | 838 |  |  |  | 656 |
Benefits paid |  |  | (3,337 | ) |  |  | (2,703 | ) |  |  | (11,195 | ) |  |  | (1,763 | ) |  |  | (2,163 | ) |  |  | (1,226 | )
Benefit obligation at plan year end |  | $ | 314,155 |  |  | $ | 246,985 |  |  | $ | 203,292 |  |  | $ | 25,937 |  |  | $ | 23,215 |  |  | $ | 20,080 |
Accumulated benefit obligation portion of above |  | $ | 280,820 |  |  | $ | 214,676 |  |  | $ | 171,384 |  |  |  |  |  |  |  |  |  |  |  |  |
Change in Fair Value of Plan Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan assets at fair value at beginning of period |  | $ | 167,033 |  |  | $ | 140,065 |  |  | $ | 97,248 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  |  | (732 | ) |  |  | 14,457 |  |  |  | 18,590 |  |  |  | — |  |  |  | — |  |  |  | — |
Company contributions |  |  | 22,158 |  |  |  | 15,214 |  |  |  | 35,422 |  |  |  | 821 |  |  |  | 1,325 |  |  |  | 570 |
Participant contributions |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 942 |  |  |  | 838 |  |  |  | 656 |
Benefits paid |  |  | (3,337 | ) |  |  | (2,703 | ) |  |  | (11,195 | ) |  |  | (1,763 | ) |  |  | (2,163 | ) |  |  | (1,226 | )
Fair value of plan assets at plan year end |  | $ | 185,122 |  |  | $ | 167,033 |  |  | $ | 140,065 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Components Of Amounts Recognized In Balance Sheet |
|  | Pension Plans |  |  | Postretirement Plans |
|  | December 31, 2011 |  |  | December 31, 2010 |  |  | December 31, 2011 |  |  | December 31, 2010 |
|  | (In thousands) |
Development of Net Amount Recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation in excess of plan assets at December 31 |  | $ | (129,033 | ) |  | $ | (79,952 | ) |  | $ | (25,937 | ) |  | $ | (23,215 | )
Amounts Recognized in Statement of Financial Position |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  | $ | (5,232 | ) |  | $ | (4,107 | ) |  | $ | (1,052 | ) |  | $ | (1,146 | )
Noncurrent liabilities |  |  | (123,801 | ) |  |  | (75,845 | ) |  |  | (24,885 | ) |  |  | (22,069 | )
Accrued benefit recognized at December 31 |  | $ | (129,033 | ) |  | $ | (79,952 | ) |  | $ | (25,937 | ) |  | $ | (23,215 | )
Amounts Recognized in Accumulated Other Comprehensive Income (Loss), Net of Tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  | $ | 23,573 |  |  | $ | 25,957 |  |  | $ | (481 | ) |  | $ | (734 | )
Actuarial loss |  |  | 45,791 |  |  |  | 15,714 |  |  |  | 5,193 |  |  |  | 5,001 |
Total |  | $ | 69,364 |  |  | $ | 41,671 |  |  | $ | 4,712 |  |  | $ | 4,267 |
Components Of Net Periodic Benefit Cost |
|  | Pension Plans |  |  | Postretirement Plans |
|  | 2011 |  |  | 2010 |  |  | 2009 |  |  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (In thousands) |
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost for benefits earned during the year |  | $ | 19,808 |  |  | $ | 18,315 |  |  | $ | 17,955 |  |  | $ | 1,599 |  |  | $ | 1,399 |  |  | $ | 1,341 |
Interest cost on accumulated benefit obligation |  |  | 13,473 |  |  |  | 12,091 |  |  |  | 10,208 |  |  |  | 1,189 |  |  |  | 1,130 |  |  |  | 1,022 |
Expected return on plan assets |  |  | (13,544 | ) |  |  | (11,207 | ) |  |  | (8,573 | ) |  |  | — |  |  |  | — |  |  |  | — |
Net amortization of unrecognized amounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost |  |  | 5,782 |  |  |  | 5,685 |  |  |  | 4,903 |  |  |  | (416 | ) |  |  | (416 | ) |  |  | (416 | )
Actuarial loss |  |  | 411 |  |  |  | 247 |  |  |  | 803 |  |  |  | 449 |  |  |  | 342 |  |  |  | 328 |
Other |  |  | — |  |  |  | — |  |  |  | (126 | ) |  |  | — |  |  |  | — |  |  |  | — |
Net periodic benefit cost |  | $ | 25,930 |  |  | $ | 25,131 |  |  | $ | 25,170 |  |  | $ | 2,821 |  |  | $ | 2,455 |  |  | $ | 2,275 |
Schedule Of Weighted-Average Assumptions Used To Determine Benefit And Net Periodic Benefit Cost |
|  | Pension Plans |  |  | Postretirement Plans |
|  | 2011 |  |  | 2010 |  |  | 2009 |  |  | 2011 |  |  | 2010 |  |  | 2009 |
Weighted-Average Assumptions Used to Determine Benefit Obligations at December 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 4.75 | % |  |  | 5.50 | % |  |  | 6.00 | % |  |  | 4.50 | % |  |  | 5.25 | % |  |  | 5.75 | %
Rate of compensation increase |  |  | 4.00 | % |  |  | 4.00 | % |  |  | 4.00 | % |  |  | N/A |  |  |  | N/A |  |  |  | N/A |
Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost for the Years Ended December 31 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 5.50 | % |  |  | 6.00 | % |  |  | 6.00 | % |  |  | 5.25 | % |  |  | 5.75 | % |  |  | 6.00 | %
Expected return on plan assets |  |  | 7.75 | % |  |  | 7.75 | % |  |  | 8.25 | % |  |  | N/A |  |  |  | N/A |  |  |  | N/A |
Rate of compensation increase |  |  | 4.00 | % |  |  | 4.00 | % |  |  | 4.00 | % |  |  | N/A |  |  |  | N/A |  |  |  | N/A |
Schedule Of Assumed Health Care Cost Trend Rates For Its Postretirement Benefits |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Health care cost trend rate assumed for next year |  |  | 8.00 | % |  |  | 7.50 | % |  |  | 7.50 | %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) |  |  | 5.50 | % |  |  | 5.00 | % |  |  | 5.00 | %
Year that the rate reaches the ultimate trend rate |  |  | 2016 |  |  |  | 2016 |  |  |  | 2015 |
Schedule Of Effects Of One-Percentage Point Change In Assumed Health Care Cost Trend Rates On Its Postretirement Benefits |
|  | 1-Percentage Point Increase |  |  | 1-Percentage Point Decrease |
|  | (In thousands) |
Effect on postretirement benefit obligation |  | $ | 662 |  |  | $ | (587 | )
Effect on net postretirement benefit cost |  |  | 65 |  |  |  | (56 | )
Schedule Of Pension Plans' Assets Investments |
|  | Percentage of Fair Value |
|  | 2011 |  |  | 2010 |
Equity securities |  |  | 36 | % |  |  | 39 | %
Debt securities |  |  | 63 | % |  |  | 60 | %
Other |  |  | 1 | % |  |  | 1 | %
Schedule Of Pension Plans' Assets Fair Value Measured On A Recurring Basis |
|  | Fair Value Measurements at December 31, 2011 |
Asset Category |  | Total |  |  | Quoted Prices in Active Markets for identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
|  | (In thousands) |
Short-term investments |  | $ | 1,257 |  |  | $ | — |  |  | $ | 1,257 |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. large value |  |  | 11,272 |  |  |  | 11,272 |  |  |  |  |  |  |  |  |
U.S. large growth |  |  | 9,172 |  |  |  | 9,172 |  |  |  |  |  |  |  |  |
U.S. mid-cap value |  |  | 1,914 |  |  |  | 1,914 |  |  |  |  |  |  |  |  |
U.S. mid-cap growth |  |  | 3,684 |  |  |  | 3,684 |  |  |  |  |  |  |  |  |
U.S. small blend |  |  | 3,784 |  |  |  |  |  |  |  | 3,784 |  |  |  |  |
Foreign large blend |  |  | 27,164 |  |  |  | 27,164 |  |  |  |  |  |  |  |  |
Diversified emerging markets |  |  | 5,306 |  |  |  | 5,306 |  |  |  |  |  |  |  |  |
Real estate |  |  | 5,405 |  |  |  | 5,405 |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government bonds |  |  | 24,372 |  |  |  |  |  |  |  | 24,372 |  |  |  |  |
Corporate bonds |  |  | 91,792 |  |  |  | 36,929 |  |  |  | 54,863 |  |  |  |  |
Total |  | $ | 185,122 |  |  | $ | 100,846 |  |  | $ | 84,276 |  |  | $ | — |
|  | Fair Value Measurements at December 31, 2010 |
Asset Category |  | Total |  |  | Quoted Prices in Active Markets for identical Assets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
|  | (In thousands) |
Short-term investments |  | $ | 1,320 |  |  | $ | — |  |  | $ | 1,320 |  |  | $ | — |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. large value |  |  | 10,594 |  |  |  | 10,594 |  |  |  |  |  |  |  |  |
U.S. large growth |  |  | 8,519 |  |  |  | 8,519 |  |  |  |  |  |  |  |  |
U.S. mid-cap value |  |  | 1,871 |  |  |  | 1,871 |  |  |  |  |  |  |  |  |
U.S. mid-cap growth |  |  | 3,486 |  |  |  | 3,486 |  |  |  |  |  |  |  |  |
U.S. small blend |  |  | 3,394 |  |  |  |  |  |  |  | 3,394 |  |  |  |  |
Foreign large blend |  |  | 26,616 |  |  |  | 26,616 |  |  |  |  |  |  |  |  |
Diversified emerging markets |  |  | 5,219 |  |  |  | 5,219 |  |  |  |  |  |  |  |  |
Real estate |  |  | 5,095 |  |  |  | 5,095 |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government bonds |  |  | 21,088 |  |  |  |  |  |  |  | 21,088 |  |  |  |  |
Corporate bonds |  |  | 79,831 |  |  |  | 33,240 |  |  |  | 46,591 |  |  |  |  |
Total |  | $ | 167,033 |  |  | $ | 94,640 |  |  | $ | 72,393 |  |  | $ | — |
Schedule Of Estimated Benefit Payments |
|  | Pension Plans |  |  | Postretirement Plans |
|  | (In thousands) |
2012 |  | $ | 5,232 |  |  | $ | 1,052 |
2013 |  |  | 6,655 |  |  |  | 1,139 |
2014 |  |  | 8,157 |  |  |  | 1,226 |
2015 |  |  | 9,813 |  |  |  | 1,380 |
2016 |  |  | 11,457 |  |  |  | 1,481 |
2017 — 2021 |  |  | 85,357 |  |  |  | 10,258 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -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 Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (d)(5) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (k) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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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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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (f) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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