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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2011
Employee Benefit Plans |
Employee Benefit Plans | Note H Employee Benefit Plans Pension expense is a component of employee benefits expense. For the three- and six-month periods ended June 30, 2011 and 2010, respectively, the components of pension expense are as follows:
|  | Three months ended June 30 |  |  | Six months ended June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Service cost |  | $ | 4,062 |  |  | $ | 3,667 |  |  | $ | 6,633 |  |  | $ | 6,671 |
Interest cost |  |  | 7,398 |  |  |  | 7,317 |  |  |  | 11,905 |  |  |  | 12,546 |
Expected return on assets |  |  | (8,817 | ) |  |  | (9,497 | ) |  |  | (14,352 | ) |  |  | (16,018 | )
Amortization of prior service cost |  |  | 66 |  |  |  | 68 |  |  |  | 105 |  |  |  | 115 |
Amortization of net actuarial loss |  |  | 1,977 |  |  |  | 1,155 |  |  |  | 3,190 |  |  |  | 2,080 |
Total pension expense |  | $ | 4,686 |  |  | $ | 2,710 |  |  | $ | 7,481 |  |  | $ | 5,394 |
The assumed discount rate for 2011 is 5.50 percent, the expected long-term rate of return on plan assets is 7.75 percent and the assumed rate of salary increases is 4.50 percent. For 2010 the assumed discount rate was 6.00 percent, expected long-term rate of return was 8.00 percent and the assumed rate of salary increases was 4.5 percent.

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