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Defined Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2013
Compensation And Retirement Disclosure [Abstract] |
Net Periodic Cost (Benefit) | The components of the combined net periodic expense for the Corporation’s defined benefit pension plans were as follows:
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Expected return on plan assets, net of expenses |  | $ | (2,772 | ) |  | $ | (2,603 | ) |  | $ | (5,544 | ) |  | $ | (5,206 | )
Interest cost on projected benefit obligation |  |  | 1,836 |  |  |  | 1,950 |  |  |  | 3,671 |  |  |  | 3,900 |
Net amortization and deferral |  |  | 1,639 |  |  |  | 1,428 |  |  |  | 3,279 |  |  |  | 2,657 |
Net periodic cost (benefit) |  | $ | 703 |  |  | $ | 775 |  |  | $ | 1,406 |  |  | $ | 1,351 |

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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=28361610&loc=d3e1928-114920 + Details
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