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Defined Benefit Plans | 9 Months Ended
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Sep. 30, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Defined Benefit Plans | Defined Benefit Plans Net periodic pension and postretirement benefit costs for the Company's defined benefit pension plans and postretirement benefit plans cover certain foreign employees, union hourly employees and salaried employees. The components of net periodic pension and postretirement benefit costs for the three and nine months ended September 30, 2016 and 2015 are as follows (dollars in thousands):
|  | Pension Plans |  | Other Postretirement Benefits
|  | Three months ended September 30, |  | Nine months ended September 30, |  | Three months ended September 30, |  | Nine months ended September 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service costs |  | $ | 250 |  |  | $ | 210 |  |  | $ | 740 |  |  | $ | 680 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest costs |  | 390 |  |  | 380 |  |  | 1,180 |  |  | 1,210 |  |  | — |  |  | 10 |  |  | 10 |  |  | 20 |
Expected return on plan assets |  | (420 | ) |  | (420 | ) |  | (1,260 | ) |  | (1,430 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost |  | — |  |  | — |  |  | 10 |  |  | 10 |  |  | — |  |  | — |  |  | — |  |  | — |
Settlement/curtailment loss |  | — |  |  | — |  |  | — |  |  | 2,750 |  |  | — |  |  | — |  |  | — |  |  | — |
Amortization of net (gain)/loss |  | 230 |  |  | 310 |  |  | 700 |  |  | 1,050 |  |  | (10 | ) |  | (10 | ) |  | (40 | ) |  | (30 | )
Net periodic benefit cost |  | $ | 450 |  |  | $ | 480 |  |  | $ | 1,370 |  |  | $ | 4,270 |  |  | $ | (10 | ) |  | $ | — |  |  | $ | (30 | ) |  | $ | (10 | )
During the three months ended June 30, 2015, the Company settled the defined benefit obligation for certain current and former Cequent employees through purchasing annuities with an insurance company. The Company recognized a one-time settlement charge of approximately $2.8 million, which is included in loss from discontinued operations in the accompanying consolidated statement of income. The Company contributed approximately $0.5 million and $1.6 million to its defined benefit pension plans during the three and nine months ended September 30, 2016, respectively. The Company expects to contribute approximately $2.0 million to its defined benefit pension plans for the full year 2016.

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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 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 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=65897934&loc=d3e2410-114920 Reference 3: 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 Reference 4: 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 5: 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=66047640&loc=d3e39622-114963 + Details
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