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Defined Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Schedule of Costs of Retirement Plans | The components of net periodic pension and postretirement benefit costs for the three months ended March 31, 2015 and 2014 are as follows:
|  | Pension Plans |  | Other Postretirement Benefits
|  | Three months ended March 31, |  | Three months ended March 31,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (dollars in thousands)
Service costs |  | $ | 240 |  |  | $ | 190 |  |  | $ | — |  |  | $ | — |
Interest costs |  | 420 |  |  | 440 |  |  | 10 |  |  | 10 |
Expected return on plan assets |  | (520 | ) |  | (520 | ) |  | — |  |  | — |
Amortization of net (gain)/loss |  | 380 |  |  | 280 |  |  | (10 | ) |  | (20 | )
Net periodic benefit cost |  | $ | 520 |  |  | $ | 390 |  |  | $ | — |  |  | $ | (10 | )

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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