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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Schedule of Net Benefit Costs [Table Text Block] | The net pension and postretirement benefit costs that have been recognized during the stated periods are shown in the following tables:
| Pension | Postretirement
| Three Months Ended June 30, |  | Three Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |
Service cost | $ | 2,011 |  |  | $ | 2,102 |  |  | $ | 249 |  |  | $ | 227 |
Interest cost | 3,953 |  |  | 4,321 |  |  | 240 |  |  | 242 |
Expected return on plan assets | (5,966 | ) |  | (6,369 | ) |  | — |  |  | — |
Amortization of prior service cost | 322 |  |  | 327 |  |  | 6 |  |  | 6 |
Amortization of losses | 4,791 |  |  | 4,394 |  |  | 218 |  |  | 156 |
Net periodic benefit cost | $ | 5,111 |  |  | $ | 4,775 |  |  | $ | 713 |  |  | $ | 631 |
| Pension |  | Postretirement
| Six Months Ended June 30, |  | Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Components of Net Periodic Benefit Cost |  |  |  |  |  |  |
Service cost | $ | 4,430 |  |  | $ | 4,042 |  |  | $ | 498 |  |  | $ | 437 |
Interest cost | 8,787 |  |  | 8,309 |  |  | 480 |  |  | 465 |
Expected return on plan assets | (13,390 | ) |  | (12,248 | ) |  | — |  |  | — |
Amortization of prior service cost | 710 |  |  | 629 |  |  | 13 |  |  | 12 |
Amortization of losses | 10,516 |  |  | 8,451 |  |  | 436 |  |  | 299 |
Net periodic benefit cost | $ | 11,053 |  |  | $ | 9,183 |  |  | $ | 1,427 |  |  | $ | 1,213 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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