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Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost, net | $ 4,025 | $ 4,149 | $ 12,233 | $ 12,509
Interest cost on projected benefit obligations | 3,256 | 3,381 | 9,764 | 9,630
Expected return on plan assets | (9,466) | (9,594) | (28,605) | (27,847)
Recognition of prior service cost | (1,820) | (1,806) | (5,527) | (5,024)
Recognition of actuarial losses/(gains) | 6,471 | 6,841 | 19,677 | 20,152
Net periodic pension cost/(credit) | 2,466 | 2,971 | 7,542 | 9,420
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost, net | 273 | 141 | 817 | 423
Interest cost on projected benefit obligations | 1,060 | 1,094 | 3,182 | 3,282
Expected return on plan assets | (1,733) | (1,684) | (5,197) | (5,052)
Recognition of prior service cost | 0 | 0 | 0 | 0
Recognition of actuarial losses/(gains) | 1,451 | 1,639 | 4,353 | 4,917
Net periodic pension cost/(credit) | 1,051 | 1,190 | 3,155 | 3,570
Other Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost, net | 3,752 | 4,008 | 11,416 | 12,086
Interest cost on projected benefit obligations | 2,180 | 2,269 | 6,534 | 6,294
Expected return on plan assets | (7,733) | (7,910) | (23,408) | (22,795)
Recognition of prior service cost | (1,727) | (1,611) | (5,248) | (4,439)
Recognition of actuarial losses/(gains) | 5,331 | 5,676 | 16,261 | 16,657
Net periodic pension cost/(credit) | 1,803 | 2,432 | $ 5,555 | 7,803
Defined Benefit Plan, Expected Future Employer Contributions, Current Fiscal Year, Description |  |  | 25900 |
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost, net | 0 | 0 | $ 0 | 0
Interest cost on projected benefit obligations | 16 | 18 | 48 | 54
Expected return on plan assets | 0 | 0 | 0 | 0
Recognition of prior service cost | (93) | (195) | (279) | (585)
Recognition of actuarial losses/(gains) | (311) | (474) | (937) | (1,422)
Net periodic pension cost/(credit) | $ (388) | $ (651) | $ (1,168) | $ (1,953)

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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Description of contributions expected to be received by defined benefit plan from employer in current fiscal year. Includes, but is not limited to, range of expected contributions, required minimum contributions and whether expected contributions are discretionary or noncash. + References No definition available. + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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