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Defined Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 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 and six months ended June 30, 2015 and 2014 are as follows:
|  | Pension Plans |  | Other Postretirement Benefits
|  | Three months ended June 30, |  | Six months ended June 30, |  | Three months ended June 30, |  | Six months ended June 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
|  | (dollars in thousands)
Service costs |  | $ | 230 |  |  | $ | 190 |  |  | $ | 470 |  |  | $ | 380 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest costs |  | 410 |  |  | 440 |  |  | 830 |  |  | 880 |  |  | — |  |  | 10 |  |  | 10 |  |  | 20 |
Expected return on plan assets |  | (490 | ) |  | (520 | ) |  | (1,010 | ) |  | (1,040 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost |  | 10 |  |  | 10 |  |  | 10 |  |  | 10 |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement/curtailment loss |  | 2,750 |  |  | — |  |  | 2,750 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net (gain)/loss |  | 360 |  |  | 280 |  |  | 740 |  |  | 560 |  |  | (10 | ) |  | (30 | ) |  | (20 | ) |  | (50 | )
Net periodic benefit cost |  | $ | 3,270 |  |  | $ | 400 |  |  | $ | 3,790 |  |  | $ | 790 |  |  | $ | (10 | ) |  | $ | (20 | ) |  | $ | (10 | ) |  | $ | (30 | )
During the second quarter of 2015, the Company recognized a one-time settlement charge associated with annuitizing the defined benefit obligations for certain current and former Cequent employees. The settlement charge of approximately $2.8 million is included in the income (loss) from discontinued operations in the accompanying consolidated statement of income. The Company contributed approximately $1.9 million and $2.6 million to its defined benefit pension plans during the three and six months ended June 30, 2015, respectively. The Company expects to contribute approximately $3.5 million to its defined benefit pension plans for the full year 2015.

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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=58740216&loc=d3e1928-114920 + Details
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