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Employee Benefit Plans | 6 Months Ended
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Jun. 30, 2012
Employee Benefit Plans [Abstract] |
Employee Benefit Plans | 9. Employee Benefit Plans The components of net periodic benefit costs for the three and six months ended June 30, 2012 and 2011 were as follows (dollars in thousands):
| Three months ended June 30, |  | Six months ended June 30, |
| 2012 |  | 2011 |  | 2012 |  | 2011 |
Net periodic pension benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 2,196 |  | $ | 1,597 |  | $ | 3,728 |  | $ | 3,012 |
Interest cost |  | 1,090 |  |  | 1,052 |  |  | 2,070 |  |  | 1,942 |
Expected return on plan assets |  | (799) |  |  | (825) |  |  | (1,533) |  |  | (1,469) |
Amortization of prior service cost |  | 87 |  |  | 94 |  |  | 186 |  |  | 101 |
Amortization of prior actuarial gain |  | 1,388 |  |  | 314 |  |  | 1,663 |  |  | 502 |
Total | $ | 3,962 |  | $ | 2,232 |  | $ | 6,114 |  | $ | 4,088 |
Net periodic other benefits cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 279 |  | $ | 212 |  | $ | 558 |  | $ | 424 |
Interest cost |  | 258 |  |  | 221 |  |  | 517 |  |  | 441 |
Expected return on plan assets |  | -- |  |  | -- |  |  | -- |  |  | -- |
Amortization of prior service cost |  | -- |  |  | -- |  |  | -- |  |  | -- |
Amortization of prior actuarial gain |  | 89 |  |  | 59 |  |  | 177 |  |  | 118 |
Total | $ | 626 |  | $ | 492 |  | $ | 1,252 |  | $ | 983 |
The Company has made pension contributions of $2.0 million during the first six months of 2012 and expects to make total pension contributions of $6.2 million in 2012.

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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