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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs for the three and nine months ended September 30, 2014 and 2013 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended September 30, |  | Three months ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost |  | $ | 2,195 |  |  | $ | 2,000 |  |  | $ | 826 |  |  | $ | 590 |
Interest Cost |  | 1,367 |  |  | 1,017 |  |  | 794 |  |  | 392 |
Expected return on plan assets |  | (1,118 | ) |  | (933 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 214 |  |  | 152 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 489 |  |  | 808 |  |  | 361 |  |  | 279 |
Net periodic benefit cost |  | $ | 3,147 |  |  | $ | 3,044 |  |  | $ | 1,981 |  |  | $ | 1,261 |
|  | Pension Benefits |  | Other Benefits
|  | Nine months ended September 30, |  | Nine months ended September 30,
|  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost |  | $ | 6,185 |  |  | $ | 6,012 |  |  | $ | 1,766 |  |  | $ | 1,411 |
Interest Cost |  | 3,662 |  |  | 3,055 |  |  | 1,471 |  |  | 1,015 |
Expected return on plan assets |  | (3,353 | ) |  | (2,800 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 432 |  |  | 459 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 1,407 |  |  | 2,427 |  |  | 795 |  |  | 651 |
Net periodic benefit cost |  | $ | 8,333 |  |  | $ | 9,153 |  |  | $ | 4,032 |  |  | $ | 3,077 |
The Company has made pension contributions of $6.5 million during the first nine months of 2014, and does not expect to make any additional pension contributions in 2014.

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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 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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