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Benefit Plans | 9 Months Ended
--- | ---
Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Benefit Plans | Benefit Plans The components of our consolidated net pension costs are set forth in the following table:
| Predecessor |  | Successor
| For the Period July 1 Through August 14, 2015 |  | For the Period August 15 Through September 30, 2015 |  | For the Three Months Ended September 30, 2016
| (Dollars in thousands)
Service cost | $ | 323 |  |  | $ | 227 |  |  | $ | 506 |
Interest cost | 762 |  |  | 776 |  |  | 1,498 |
Expected return on plan assets | (676 | ) |  | (658 | ) |  | (1,310 | )
Amortization of prior service cost | 1 |  |  | — |  |  | 3 |
Net cost | $ | 410 |  |  | $ | 345 |  |  | $ | 697 |
| Predecessor |  | Successor
| For the Period January 1 Through August 14, 2015 |  | For the Period August 15 Through September 30, 2015 |  | For the Nine Months Ended September 30, 2016
| (Dollars in thousands)
Service cost | $ | 1,656 |  |  | $ | 227 |  |  | $ | 1,517 |
Interest cost | 3,814 |  |  | 776 |  |  | 4,494 |
Expected return on plan assets | (3,384 | ) |  | (658 | ) |  | (3,929 | )
Amortization of prior service cost | 3 |  |  | — |  |  | 7 |
Net cost | $ | 2,089 |  |  | $ | 345 |  |  | $ | 2,089 |
The components of our consolidated net postretirement costs are set forth in the following table:
| Predecessor |  | Successor
| For the Period July 1 Through August 14, 2015 |  | For the Period August 15 Through September 30, 2015 |  | For the Three Months Ended September 30, 2016
| (Dollars in thousands)
Service cost | $ | 3 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost | 156 |  |  | 152 |  |  | 272 |
Amortization of prior service cost | (22 | ) |  | — |  |  | — |
Net cost | $ | 137 |  |  | $ | 154 |  |  | $ | 273 |
| Predecessor |  | Successor
| For the Period January 1 Through August 14, 2015 |  | For the Period August 15 Through September 30, 2015 |  | For the Nine Months Ended September 30, 2016
| (Dollars in thousands)
Service cost | $ | 11 |  |  | $ | 2 |  |  | $ | 3 |
Interest cost | 786 |  |  | 152 |  |  | 815 |
Amortization of prior service cost | (108 | ) |  | — |  |  | — |
Net cost | $ | 689 |  |  | $ | 154 |  |  | $ | 818 |

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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=49170332&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=58740216&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=6414199&loc=d3e39622-114963 + Details
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