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Retirement and Benefit Plans (Details) - USD ($) $ in Thousands |  |  | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 03, 2018 | Apr. 25, 2018 | Jun. 30, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Apr. 25, 2018 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Percentage of defined benefit plan assets transferred out of plan | 40.00% | 33.00% |  |  |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |  |  |  |  |
Net periodic benefit expense |  |  |  |  |  |  | $ 13,026 | $ 683 |
Pension contributions [Abstract] |  |  |  |  |  |  |  |  |
Pension contributions |  |  |  |  |  |  | 1,042 | 1,145 |
Pension Plan [Member] |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Increase (Decrease) for Assets Transferred to (from) Plan | $ 122,000 | $ 151,800 |  |  |  |  |  |  |
Actuarial gain (loss) |  |  |  | $ 13,300 |  |  |  |  |
Discount Rate |  | 4.05% |  |  |  | 4.05% |  |  | 3.40%
Expected Long-term Rate of Return on Plan Assets |  |  | 4.50% |  |  | 4.75% |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |  |  |  |  |
Service cost |  |  |  | 198 | $ 301 |  | 403 | 602 |
Interest cost |  |  |  | 3,312 | 4,382 |  | 7,323 | 8,758 |
Expected return on plan assets |  |  |  | (3,292) | (4,742) |  | (7,880) | (9,482) |
Amortization of actuarial loss |  |  |  | 356 | 410 |  | 1,177 | 805 |
Plan settlement loss | $ 10,000 |  |  | 12,003 | 0 |  | 12,003 | 0 |
Net periodic benefit expense |  |  |  | 12,577 | $ 351 |  | 13,026 | $ 683 |
Pension contributions [Abstract] |  |  |  |  |  |  |  |  |
Estimated remaining 2018 pension contributions |  |  | $ 21,000 | 21,000 |  |  | 21,000 |  |
Discretionary estimated remaining 2018 pension contributions |  |  | $ 20,000 | $ 20,000 |  |  | $ 20,000 |  |

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- Definition Amount of discretionary contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References No definition available. + Details
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- Definition Percentage of defined benefit plan assets transferred out of the plan. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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