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Multiemployer Pension Plans - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) plan | Dec. 31, 2019 USD ($)
Multiemployer Plans [Line Items] |  |
Multiemployer plans surcharge percentage | 53.00% |
Multiemployer plan, contributions | $ 16,109 | $ 17,052
CBAs |  |
Multiemployer Plans [Line Items] |  |
Multiemployer plan, contributions | $ 16,100 | $ 17,100
MEPP |  |
Multiemployer Plans [Line Items] |  |
Multiemployer plans number of employer | plan | 40 |
MEPP | PPA |  |
Multiemployer Plans [Line Items] |  |
Multiemployer plans surcharge percentage | 5.00% |
MEPP | CBA |  |
Multiemployer Plans [Line Items] |  |
Multiemployer plans surcharge percentage | 10.00% |

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- Definition Number of employer under multiemployer plan . A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Percentage of surcharge under multiemployer plan. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References No definition available. + Details
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- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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