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Employee Benefit Plans - Fair Value of Plan Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan Fair Value Of Plan Assets Gross | $ 203,314 | $ 177,057 |
Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 21,276 | 18,597 | $ 21,283
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Sold | 6 | 14 |
Actual return on plan assets still held | 349 | 319 |
Sales |  | (4,971) |
Foreign currency translation | 1,720 | 337 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase for Purchase | 1,715 | 1,615 |
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Decrease for Settlement | 1,111 |  |
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Nonqualified Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 | 0
Foreign currency translation | 0 | 0 |
United States | Pension Plan [Member] | Qualified Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 606,896 | 550,238 | 488,900
Defined Benefit Plan Fair Value Of Plan Assets Gross | 413,468 | 293,751 |
Foreign currency translation | 0 | 0 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 11,650 | 7,284 |
Defined Benefit Plan Fair Value Of Plan Assets Gross | 11,650 | 7,284 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 401,818 | 286,467 |
Defined Benefit Plan Fair Value Of Plan Assets Gross | 401,818 | 286,467 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 329,800 | 216,981 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Corporate bonds [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 329,800 | 216,981 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 80,551 | 75,332 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 8,533 | 5,846 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Government securities [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 72,018 | 69,486 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,117 | 1,438 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 3,117 | 1,438 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Private Placement [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 180,103 | 241,058 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 13,325 | 15,429 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
United States | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 212,748 | 185,590 | $ 162,589
Defined Benefit Plan Fair Value Of Plan Assets Gross | 133,625 | 117,223 |
Foreign currency translation | 13,483 | 3,909 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 85,100 | 75,236 |
Defined Benefit Plan Fair Value Of Plan Assets Gross | 85,100 | 75,236 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 27,249 | 23,390 |
Defined Benefit Plan Fair Value Of Plan Assets Gross | 27,249 | 23,390 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 21,276 | 18,597 |
Defined Benefit Plan Fair Value Of Plan Assets Gross | 21,276 | 18,597 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 74,138 | 64,000 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Collective funds at NAV [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,822 | 3,752 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 2,822 | 3,752 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Common stocks [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 52,865 | 44,685 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Common stocks [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 52,865 | 44,685 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Common stocks [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Common stocks [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Fixed income investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 26,068 | 19,871 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Fixed income investments [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Fixed income investments [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 26,068 | 19,871 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Fixed income investments [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Mutual Fund [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 29,413 | 26,799 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Mutual Fund [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 29,413 | 26,799 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Mutual Fund [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Mutual Fund [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Other plan assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 22,457 | 22,116 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Other plan assets [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Other plan assets [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 1,181 | 3,519 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Other plan assets [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 21,276 | 18,597 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Net Asset Value (NAV) Other [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 4,985 | 4,367 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Net Asset Value (NAV) Other [Member] | Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Net Asset Value (NAV) Other [Member] | Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | 0 | 0 |
Foreign Plan [Member] | Pension Plan [Member] | Qualified Plan [Member] | Net Asset Value (NAV) Other [Member] | Level 3 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair Value of Plan Assets | $ 0 | $ 0 |

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + 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 (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=118255775&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=118257860&loc=d3e4179-114921 + Details
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