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Benefit Plans | 3 Months Ended
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Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract] |
Benefit Plans | Benefit Plans The components of our consolidated net pension costs are set forth in the following table:
|  | For the Three Months Ended
|  | March 31,
|  | 2014 |  | 2015
|  | (Dollars in thousands)
Service cost |  | $ | 473 |  |  | $ | 827 |
Interest cost |  | 2,169 |  |  | 1,526 |
Expected return on plan assets |  | (1,938 | ) |  | (1,354 | )
Amortization of prior service cost |  | 1 |  |  | 1 |
Net cost |  | $ | 705 |  |  | $ | 1,000 |
The components of our consolidated net postretirement costs are set forth in the following table:
|  | For the Three Months Ended
|  | March 31,
|  | 2014 |  | 2015
|  | (Dollars in thousands)
Service cost |  | $ | 19 |  |  | $ | 4 |
Interest cost |  | 352 |  |  | 315 |
Amortization of prior service benefit |  | (47 | ) |  | (43 | )
Net cost |  | $ | 324 |  |  | $ | 276 |
On March 27, 2015, we settled $59.0 million of projected benefit obligations through the purchase of a group annuity contract. The purchase was fully funded with pension assets. The obligation associated with this transaction will require no additional cash contributions by the company. The results of this settlement were not material to our operations.

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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=49170846&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=58740216&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=49170332&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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