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Employee Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net periodic benefit cost [Abstract] |  |  |
Settlement & curtailment (gain) loss | $ (9,926) | $ 2,462 | $ 0
Total net periodic benefit cost | 11,912 | 12,191 | 25,364
Supplemental Employee Retirement Plans, Defined Benefit [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Amortization of prior service costs (income) | 3,770 | 4,411 | 6,266
Amortization of actuarial (gains) losses | (1,132) | (1,192) | (560)
Settlement & curtailment (gain) loss | (1,381) | 0 | 0
Defined Benefit Plan, Other Cost (Credit) | 0 | 0 | 0
Total net periodic benefit cost | 7,085 | 9,768 | 13,933
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Service cost | 2,624 | 2,473 | 2,959
Interest cost | 3,204 | 4,076 | 5,268
Expected return on plan assets | 0 | 0 | 0
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Service cost | 30 | 68 | 52
Interest cost | 290 | 783 | 403
Amortization of prior service costs (income) | 13 | 7 | 7
Amortization of actuarial (gains) losses | (30) | (161) | 5
Settlement & curtailment (gain) loss | 0 | (4,598) | 0
Total net periodic benefit cost | 303 | (3,901) | 467
Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Service cost | 9,019 | 12,083 | 13,913
Interest cost | 20,756 | 21,718 | 23,046
Expected return on plan assets | (39,045) | (39,812) | (38,793)
Amortization of prior service costs (income) | 298 | 427 | 733
Amortization of actuarial (gains) losses | 3,102 | 5,582 | 6,437
Amortization of transition obligation | 0 | 0 | 0
Settlement & curtailment (gain) loss | 13,939 | 76 | 0
Defined Benefit Plan, Other Cost (Credit) | 0 | 0 | 35
Total net periodic benefit cost | 8,069 | 74 | 5,371
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Service cost | 5,359 | 5,688 | 5,590
Interest cost | 4,962 | 5,263 | 5,593
Expected return on plan assets | (7,675) | (7,417) | (7,830)
Amortization of prior service costs (income) | (449) | (425) | (397)
Amortization of actuarial (gains) losses | 2,952 | 3,506 | 2,658
Amortization of transition obligation | (1) | (4) | (4)
Settlement & curtailment (gain) loss | 7 | 678 | 1,103
Defined Benefit Plan, Other Cost (Credit) | 0 | 0 | 0
Total net periodic benefit cost | 5,157 | 7,297 | 6,721
Continuing Operations [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Total net periodic benefit cost | 6,806 | 8,542 | 12,711
Continuing Operations [Member] | Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Total net periodic benefit cost | (2,040) | (3,309) | 1,134
Continuing Operations [Member] | Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Total net periodic benefit cost | 5,043 | 6,487 | 5,747
Discontinued Operations [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Settlement & curtailment (gain) loss | 9,200 |  |
Discontinued Operations [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Total net periodic benefit cost | 279 | 1,226 | 1,222
Discontinued Operations [Member] | Domestic Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Total net periodic benefit cost | 10,109 | 3,383 | 4,237
Discontinued Operations [Member] | Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] |  |  |
Net periodic benefit cost [Abstract] |  |  |
Total net periodic benefit cost | $ 114 | $ 810 | $ 974

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -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 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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 Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of 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)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&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/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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- Definition Amount of net periodic benefit cost (credit) for 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 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 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 (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from settlement and curtailment. + 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)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -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 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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