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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2012
General Discussion of Pension and Other Postretirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans Pension expense is a component of employee benefits expense. For the three-month periods ended March 31, 2012 and 2011 the components of pension expense are as follows:
| Three Months Ended March 31
| 2012 |  | 2011
Service cost | $ | 2,827 |  |  | $ | 2,571 |
Interest cost | 4,496 |  |  | 4,507 |
Expected return on assets | (5,379 | ) |  | (5,535 | )
Amortization of prior service cost | 53 |  |  | 39 |
Amortization of net actuarial loss | 2,737 |  |  | 1,213 |
Total pension expense | $ | 4,734 |  |  | $ | 2,795 |
The assumed discount rate for 2012 is 4.75 percent, the expected long-term rate of return on plan assets is 7.50 percent and the assumed rate of salary increases is 4.00 percent. For 2011 the assumed discount rate was 5.50 percent, expected long-term rate of return was 7.75 percent and the assumed rate of salary increases was 4.50 percent.

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. 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