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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2011
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] |
| Pension |  | Postretirement
| 2011 |  | 2010 |  | 2011 |  | 2010
Change in Projected Benefit Obligation |  |  |  |  |  |  |
Projected benefit obligation at beginning of year | $ | 346,464 |  |  | $ | 324,554 |  |  | $ | 21,158 |  |  | $ | 21,361 |
Service cost | 6,782 |  |  | 6,196 |  |  | 673 |  |  | 587 |
Interest cost | 18,087 |  |  | 17,740 |  |  | 972 |  |  | 1,029 |
Actuarial loss | 58,208 |  |  | 11,766 |  |  | 3,934 |  |  | 965 |
Plan amendments | — |  |  | 1,704 |  |  | (631 | ) |  | — |
Employee contributions | — |  |  | — |  |  | 1,609 |  |  | 1,042 |
Benefits paid | (16,394 | ) |  | (15,496 | ) |  | (2,882 | ) |  | (3,826 | )
Projected benefit obligation at end of year | $ | 413,147 |  |  | $ | 346,464 |  |  | $ | 24,833 |  |  | $ | 21,158 |
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] |
Change in Plan Assets |  |  |  |  |  |  |
Fair value of plan assets at beginning of year | $ | 302,464 |  |  | $ | 231,686 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 8,977 |  |  | 35,636 |  |  | — |  |  | — |
Employer contributions | 1,552 |  |  | 51,510 |  |  | 1,273 |  |  | 2,784 |
Employee contributions | — |  |  | — |  |  | 1,609 |  |  | 1,042 |
Benefits paid | (16,394 | ) |  | (15,496 | ) |  | (2,882 | ) |  | (3,826 | )
Other expense | (944 | ) |  | (872 | ) |  | — |  |  | — |
Fair value of plan assets at end of year | $ | 295,655 |  |  | $ | 302,464 |  |  | $ | — |  |  | $ | — |
Schedule of Net Funded Status [Table Text Block] |
Funded Status at End of Year: |  |  |  |  |  |  |
Net accrued benefit cost | $ | (117,492 | ) |  | $ | (44,000 | ) |  | $ | (24,833 | ) |  | $ | (21,158 | )
Schedule of Amounts Recognized in Balance Sheet [Table Text Block] |
Amounts Recognized in the Consolidated |  |  |  |  |  |  |
Balance Sheets Consist of: |  |  |  |  |  |  |
Noncurrent assets | $ | — |  |  | $ | 3,032 |  |  | $ | — |  |  | $ | — |
Current liabilities | (1,626 | ) |  | (1,475 | ) |  | (1,262 | ) |  | (1,566 | )
Noncurrent liabilities | (115,866 | ) |  | (45,557 | ) |  | (23,571 | ) |  | (19,592 | )
Net amount recognized | $ | (117,492 | ) |  | $ | (44,000 | ) |  | $ | (24,833 | ) |  | $ | (21,158 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | Net gains or losses and prior service costs or credits recognized in other comprehensive income for the three years ended December 31 are as follows:
| Pension |  | Postretirement
| 2011 |  | 2010 |  | 2009 |  | 2011 |  | 2010 |  | 2009
Net (losses) gains | $ | (75,995 | ) |  | $ | 1,348 |  |  | $ | 7,778 |  |  | $ | (3,934 | ) |  | $ | (965 | ) |  | $ | (533 | )
Prior service cost | — |  |  | (1,704 | ) |  | (5,352 | ) |  | 631 |  |  | — |  |  | — |
Net gains or losses and prior service costs or credits reclassified from other comprehensive income and recognized as a component of pension and postretirement expense for the three years ended December 31 are as follows:
| Pension |  | Postretirement
| 2011 |  | 2010 |  | 2009 |  | 2011 |  | 2010 |  | 2009
Amortization of losses | $ | 10,372 |  |  | $ | 6,456 |  |  | $ | 6,196 |  |  | $ | 570 |  |  | $ | 3,357 |  |  | $ | 5,841 |
Amortization of prior service cost (benefit) | 1,359 |  |  | 1,657 |  |  | 1,830 |  |  | 69 |  |  | (5,334 | ) |  | (9,480 | )
Schedule of Net Periodic Benefit Cost Not yet Recognized [Table Text Block] | Net losses and prior service costs or credits that have not yet been included in pension and postretirement expense for the two years ended December 31, which have been recognized as a component of AOCI are as follows:
| Pension |  | Postretirement
| 2011 |  | 2010 |  | 2011 |  | 2010
Prior service (cost) credit | $ | (8,370 | ) |  | $ | (9,729 | ) |  | $ | 167 |  |  | $ | (532 | )
Net losses | (191,761 | ) |  | (126,138 | ) |  | (10,500 | ) |  | (7,137 | )
Deferred income tax benefit | 62,797 |  |  | 43,056 |  |  | 3,583 |  |  | 2,659 |
AOCI | $ | (137,334 | ) |  | $ | (92,811 | ) |  | $ | (6,750 | ) |  | $ | (5,010 | )
Schedule of Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Fair Value [Table Text Block] | For pension and postretirement plans with accumulated benefit obligations in excess of plan assets, the following table sets forth the projected and accumulated benefit obligations and the fair value of plan assets for the two years ended December 31:
| 2011 |  | 2010
Projected benefit obligation | $ | 437,980 |  |  | $ | 323,918 |
Accumulated benefit obligation | 392,182 |  |  | 285,590 |
Fair value of plan assets | 295,655 |  |  | 255,728 |
Schedule of Net Benefit Costs [Table Text Block] | The following tables set forth the components of net pension and postretirement benefit cost that have been recognized during the three years ended December 31:
| Pension |  | Postretirement
| 2011 |  | 2010 |  | 2009 |  | 2011 |  | 2010 |  | 2009
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 6,782 |  |  | $ | 6,196 |  |  | $ | 6,489 |  |  | $ | 673 |  |  | $ | 587 |  |  | $ | 482 |
Interest cost | 18,087 |  |  | 17,740 |  |  | 18,082 |  |  | 972 |  |  | 1,029 |  |  | 1,144 |
Expected return on plan assets | (25,819 | ) |  | (21,651 | ) |  | (21,427 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service cost (benefit) | 1,359 |  |  | 1,657 |  |  | 1,830 |  |  | 69 |  |  | (5,334 | ) |  | (9,480 | )
Amortization of losses | 10,372 |  |  | 6,456 |  |  | 6,196 |  |  | 570 |  |  | 3,357 |  |  | 5,841 |
Net periodic benefit cost (benefit) | $ | 10,781 |  |  | $ | 10,398 |  |  | $ | 11,170 |  |  | $ | 2,284 |  |  | $ | (361 | ) |  | $ | (2,013 | )
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] | The estimated pre-tax amounts that will be amortized from AOCI into net periodic benefit cost in 2012 are as follows:
| Pension |  | Postretirement
Amortization of loss | $ | 16,185 |  |  | $ | 526 |
Amortization of prior service cost | 1,308 |  |  | 25 |
Total amortization of AOCI loss | $ | 17,493 |  |  | $ | 551 |
Schedule of Assumptions Used [Table Text Block] | The following table sets forth the principal assumptions inherent in the determination of benefit obligations and net periodic benefit cost of the pension and postretirement benefit plans as of December 31:
| Pension |  | Postretirement
| 2011 |  | 2010 |  | 2009 |  | 2011 |  | 2010 |  | 2009
Assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.20 | % |  | 5.25 | % |  | 5.80 | % |  | 4.10 | % |  | 5.10 | % |  | 5.50 | %
Rate of compensation increase | 4.50 | % |  | 4.50 | % |  | 4.50 | % |  | 4.50 | % |  | 4.50 | % |  | 4.50 | %
Assumptions used to determine net periodic benefit cost for years ended December 31: |  |  |  |  |  |  |  |  |  |  |
Discount rate | 5.25 | % |  | 5.80 | % |  | 6.15 | % |  | 5.10 | % |  | 5.50 | % |  | 6.15 | %
Expected long-term return on plan assets | 8.50 | % |  | 8.50 | % |  | 8.50 | % |  | — |  |  | — |  |  | — |
Rate of compensation increase | 4.50 | % |  | 4.50 | % |  | 4.50 | % |  | 4.50 | % |  | 4.50 | % |  | 4.50 | %
Schedule of Health Care Cost Trend Rates [Table Text Block] | The following table sets forth the assumed health care cost trend rates at December 31:
| Postretirement
| 2011 |  | 2010
Health care cost trend rate assumed for next year | 8.00 | % |  | 8.50 | %
Rate to which the cost trend rate is assumed to decline (ultimate trend rate) | 5.00 | % |  | 5.00 | %
Year that the rate reaches the ultimate trend rate | 2017 |  |  | 2017 |
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | The following table shows the effect of a one percentage point change in assumed health care cost trends:
| 1 Percent
Effect on: | Increase |  | Decrease
Total of service and interest cost components | $ | 171 |  |  | $ | (143 | )
Accumulated postretirement benefit obligation | 1,781 |  |  | (1,533 | )
Schedule of Allocation of Plan Assets [Table Text Block] | The Company’s pension plans’ asset allocation at December 31, 2011 and 2010, and target allocation ranges by asset category are as follows:
| Percentage of Plan Assets |  | Target Allocation Range
Asset Category | 2011 |  | 2010 |
Domestic equity securities | 44 | % |  | 44 | % |  | 40-45%
International equity securities | 20 | % |  | 23 | % |  | 20-30%
Domestic fixed income securities | 28 | % |  | 25 | % |  | 25-30%
International fixed income securities | 5 | % |  | 5 | % |  | 4-6%
Real estate fund | 3 | % |  | 3 | % |  | 2-4%
Total | 100 | % |  | 100 | % |  |
The following table sets forth by level, within the fair value hierarchy (see Note 2 — Summary of Significant Accounting Policies for definition), the assets of the plans as of December 31, 2011 and 2010:
Asset Category | Fair Value at December 31, 2011 Level 1 |  | Fair Value at December 31, 2010 Level 1
Domestic equity securities | $ | 128,834 |  |  | $ | 130,274 |
International equity securities | 57,728 |  |  | 68,878 |
Domestic fixed income securities | 80,243 |  |  | 75,090 |
International fixed income securities | 14,381 |  |  | 14,410 |
Real estate fund | 9,846 |  |  | 8,986 |
Short-term investments | 4,623 |  |  | 4,826 |
Total | $ | 295,655 |  |  | $ | 302,464 |
Schedule of Expected Benefit Payments [Table Text Block] | Expected benefit payments in future years are as follows:
| Pension Benefits |  | Postretirement Benefits
2012 | $ | 17,607 |  |  | $ | 1,262 |
2013 | 18,657 |  |  | 1,388 |
2014 | 19,745 |  |  | 1,483 |
2015 | 20,721 |  |  | 1,559 |
2016 | 21,773 |  |  | 1,651 |
2017 - 2021 | 123,358 |  |  | 8,281 |

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- Definition Tabular disclosure of accumulated benefit obligations, projected benefit obligations, and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated and projected benefit obligations exceed the fair value of plan assets. + References No definition available. + 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 amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Subparagraph (c) -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 net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (i) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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