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Defined Benefit Plans | 9 Months Ended
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Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract] |
Defined Benefit Plans | Defined Benefit Plans The components of the combined net periodic expense for the Corporation’s defined benefit pension plans were as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
Expected return on plan assets, net of expenses | $ | (2,772 | ) |  | $ | (2,603 | ) |  | $ | (8,316 | ) |  | $ | (7,809 | )
Interest cost on projected benefit obligation | 1,835 |  |  | 1,951 |  |  | 5,506 |  |  | 5,851 |
Net amortization and deferral | 1,640 |  |  | 1,427 |  |  | 4,919 |  |  | 4,084 |
Net periodic cost (benefit) | $ | 703 |  |  | $ | 775 |  |  | $ | 2,109 |  |  | $ | 2,126 |
The Corporation’s non-qualified defined benefit pension plan is not funded. No contributions to the qualified defined benefit pension plan were made during the nine months ended September 30, 2013. The Corporation does not expect to make any contributions to the qualified defined benefit plan during the remainder of 2013.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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