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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The components of net periodic benefit costs for the three months ended March 31, 2015 and 2014 were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | Three months ended March 31, |  | Three months ended March 31,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost |  | $ | 2,030 |  |  | $ | 1,501 |  |  | $ | 589 |  |  | $ | 470 |
Interest Cost |  | 1,243 |  |  | 808 |  |  | 491 |  |  | 338 |
Expected return on plan assets |  | (1,118 | ) |  | (933 | ) |  | — |  |  | — |
Amortization of prior service cost |  | 83 |  |  | 2 |  |  | — |  |  | — |
Amortization of prior actuarial loss |  | 439 |  |  | 673 |  |  | 265 |  |  | 217 |
Net periodic benefit cost |  | $ | 2,677 |  |  | $ | 2,051 |  |  | $ | 1,345 |  |  | $ | 1,025 |
The Company has made no pension contributions during the first three months of 2015, and expects to make total pension contributions of $3.7 million in 2015.

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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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