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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2011
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The net pension and postretirement benefit costs that have been recognized during the stated periods are shown in the following table:
| Pension | Postretirement
| Three Months Ended June 30, |  | Three Months Ended June 30, |
| 2011 |  | 2010 |  | 2011 |  | 2010 |
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |  |
Service cost | $ | 1,695 |  |  | $ | 1,452 |  |  | $ | 182 |  |  | $ | 146 |  |
Interest cost | 4,522 |  |  | 4,291 |  |  | 236 |  |  | 257 |  |
Expected return on plan assets | (6,455 | ) |  | (5,416 | ) |  | — |  |  | — |  |
Amortization of prior service cost | 340 |  |  | 518 |  |  | 22 |  |  | 22 |  |
Amortization of plan amendment | — |  |  | — |  |  | — |  |  | (2,392 | ) |
Amortization of losses | 2,593 |  |  | 1,130 |  |  | 66 |  |  | 1,478 |  |
Net periodic benefit cost | $ | 2,695 |  |  | $ | 1,975 |  |  | $ | 506 |  |  | $ | (489 | ) |
| Pension | Postretirement
| Six Months Ended June 30, |  | Six Months Ended June 30, |
| 2011 |  | 2010 |  | 2011 |  | 2010 |
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |  |
Service cost | $ | 3,390 |  |  | $ | 3,098 |  |  | $ | 364 |  |  | $ | 292 |  |
Interest cost | 9,044 |  |  | 8,870 |  |  | 472 |  |  | 514 |  |
Expected return on plan assets | (12,910 | ) |  | (10,826 | ) |  | — |  |  | — |  |
Amortization of prior service cost | 680 |  |  | 829 |  |  | 44 |  |  | 44 |  |
Amortization of plan amendment | — |  |  | — |  |  | — |  |  | (4,784 | ) |
Amortization of losses | 5,186 |  |  | 3,228 |  |  | 132 |  |  | 2,956 |  |
Net periodic benefit cost | $ | 5,390 |  |  | $ | 5,199 |  |  | $ | 1,012 |  |  | $ | (978 | ) |

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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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