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Pension Plan (Tables) | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010
Pension Plan [Abstract] |  |
Schedule Of Reconciliation Of Defined Benefit Pension Plan |
|  | 2011 |  |  | 2010 |
|  | (000s) |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 73,402 |  |  | $ | 61,451 |
Actual return (loss) on plan assets |  |  | 5,689 |  |  |  | 10,027 |
Employer contributions |  |  | 14,065 |  |  |  | 6,657 |
Benefits paid |  |  | (4,541 | ) |  |  | (4,256 | )
Administrative expenses |  |  | (675 | ) |  |  | (477 | )
Fair value of plan assets at end of year |  | $ | 87,940 |  |  | $ | 73,402 |
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 93,513 |  |  | $ | 85,476 |
Service cost |  |  | 1,162 |  |  |  | 1,140 |
Interest cost |  |  | 5,047 |  |  |  | 4,958 |
Benefits paid |  |  | (4,541 | ) |  |  | (4,256 | )
Actuarial (gain) loss |  |  | 13,265 |  |  |  | 6,195 |
Benefit obligation at end of year |  | $ | 108,446 |  |  | $ | 93,513 |
Amounts recognized in the Consolidated Balance Sheet: |  |  |  |  |  |  |  |
Other noncurrent liabilities |  |  | 20,506 |  |  |  | 20,110 |
Total liability at end of year |  | $ | 20,506 |  |  | $ | 20,110 |
Additional year end information for Pension Plan |  |  |  |  |  |  |  |
Projected benefit obligation |  | $ | 108,446 |  |  | $ | 93,513 |
Accumulated benefit obligation |  |  | 106,609 |  |  |  | 91,559 |
Fair value of plan assets |  |  | 87,940 |  |  |  | 73,402 |
Schedule Of Components Of Net Periodic Cost (Benefit) |
|  | 2011 |  |  | 2010 |  |  | 2009 |
|  | (000s) |
Components of net periodic cost (benefit) |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 1,162 |  |  | $ | 1,140 |  |  | $ | 1,191 |
Interest cost |  |  | 5,047 |  |  |  | 4,958 |  |  |  | 4,834 |
Expected return on plan assets |  |  | (6,566 | ) |  |  | (5,151 | ) |  |  | (3,927 | )
Recognized actuarial loss |  |  | 2,427 |  |  |  | 2,538 |  |  |  | 4,676 |
Net periodic cost |  | $ | 2,070 |  |  | $ | 3,485 |  |  | $ | 6,774 |
Schedule Of Measurement Dates |
|  | 2011 |  |  | 2010 |
Measurement Dates |  |  |  |  |  |  |  |
Benefit obligations |  |  | 12/31/2011 |  |  |  | 12/31/2010 |
Fair value of plan assets |  |  | 12/31/2011 |  |  |  | 12/31/2010 |
Schedule Of Weighted Average Assumptions |
|  | 2011 |  |  | 2010 |
Weighted average assumptions as of December 31 |  |  |  |  |  |  |  |
Discount rate |  |  | 4.40 | % |  |  | 5.54 | %
Rate of compensation increase |  |  | 4.00 | % |  |  | 4.00 | %
Schedule Of Weighted-Average Assumptions For Net Periodic Benefit Cost Calculations |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Weighted-average assumptions for net periodic benefit cost calculations |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 5.54 | % |  |  | 5.96 | % |  |  | 5.87 | %
Expected long-term rate at return on plan assets |  |  | 8.00 | % |  |  | 8.00 | % |  |  | 8.00 | %
Rate of compensation increase |  |  | 4.00 | % |  |  | 4.00 | % |  |  | 4.00 | %
Schedule Of Market Values Of Pension Plan Assets |
December 31, 2011 |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Equities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap |  | $ | 18,921 |  |  | $ | — |  |  | $ | 18,921 |  |  | $ | — |
U.S. Mid Cap |  |  | 1,281 |  |  |  | — |  |  |  | 1,281 |  |  |  | — |
U.S. Small-Mid Cap |  |  | 6,332 |  |  |  | — |  |  |  | 6,332 |  |  |  | — |
U.S. Small Cap |  |  | 1,282 |  |  |  | — |  |  |  | 1,282 |  |  |  | — |
International Developed |  |  | 8,692 |  |  |  | — |  |  |  | 8,692 |  |  |  | — |
Emerging Markets |  |  | 3,123 |  |  |  | — |  |  |  | 3,123 |  |  |  | — |
Fixed income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long Duration Fixed Income |  |  | 44,587 |  |  |  | — |  |  |  | 44,587 |  |  |  | — |
Real Estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REIT Fund |  |  | 3,269 |  |  |  | — |  |  |  | 3,269 |  |  |  | — |
Tangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Cash/Currency: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Equivalents |  |  | 453 |  |  |  | — |  |  |  | 453 |  |  |  | — |
Total market value |  | $ | 87,940 |  |  | $ | — |  |  | $ | 87,940 |  |  | $ | — |
December 31, 2010 |  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Equities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Large Cap |  | $ | 22,010 |  |  | $ | — |  |  | $ | 22,010 |  |  | $ | — |
U.S. Mid Cap |  |  | 1,468 |  |  |  | — |  |  |  | 1,468 |  |  |  | — |
U.S. Small-Mid Cap |  |  | 6,295 |  |  |  | — |  |  |  | 6,295 |  |  |  | — |
U.S. Small Cap |  |  | 1,471 |  |  |  | — |  |  |  | 1,471 |  |  |  | — |
International Developed |  |  | 10,353 |  |  |  | — |  |  |  | 10,353 |  |  |  | — |
Emerging Markets |  |  | 3,709 |  |  |  | — |  |  |  | 3,709 |  |  |  | — |
Fixed income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Core Fixed Income |  |  | 11,542 |  |  |  | — |  |  |  | 11,542 |  |  |  | — |
Long Duration Fixed Income |  |  | 11,421 |  |  |  | — |  |  |  | 11,421 |  |  |  | — |
Real Estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
REIT Fund |  |  | 3,740 |  |  |  | — |  |  |  | 3,740 |  |  |  | — |
Tangible Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Cash/Currency: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash Equivalents |  |  | 1,393 |  |  |  | — |  |  |  | 1,393 |  |  |  | — |
Total market value |  | $ | 73,402 |  |  | $ | — |  |  | $ | 73,402 |  |  | $ | — |
Schedule Of Estimated Future Benefit Payments |
Estimated Future Benefit Payments (000s) |  |  |  |
2012 |  | $ | 5,100 |
2013 |  |  | 5,400 |
2014 |  |  | 5,664 |
2015 |  |  | 5,895 |
2016 |  |  | 6,117 |
2017-2021 |  |  | 33,216 |
Total |  | $ | 61,392 |
Schedule Of Plan Assets Category |
|  | 2011 |  |  | 2010 |
Plan Assets |  |  |  |  |  |  |  |
Asset Category |  |  |  |  |  |  |  |
Equity securities |  |  | 45 | % |  |  | 62 | %
Fixed income securities |  |  | 50 | % |  |  | 31 | %
Other |  |  | 5 | % |  |  | 7 | %
Total |  |  | 100 | % |  |  | 100 | %
Schedule Of Asset Allocation Policy And Ranges For Overall Risk And Return Objectives Of Portfolio |
|  | Policy |  |  | As of 12/31/11 |  |  | Permitted Range |
Total Equity |  |  | 46 | % |  |  | 45 | % |  |  | 43-49 | %
Total Fixed Income |  |  | 50 | % |  |  | 50 | % |  |  | 45-55 | %
Other |  |  | 4 | % |  |  | 5 | % |  |  | 0-10 | %

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