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Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2016
Pension Costs |
Defined Benefit Plan Disclosure [Line Items] |
Schedule Of Benefit Plans |
| 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 |
Postretirement Costs |
Defined Benefit Plan Disclosure [Line Items] |
Schedule Of Benefit Plans |
| 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 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: 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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