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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Payment Required Upon Termination Of Employment [Line Items] |  |  |
Minimum purchase commitments | $ 4,000,000.0 |  |
Damages sought | 50,000,000 |  |
Loss contingency accrual | 27,500,000 |  |
Outstanding letters of credit to insurance company as security for workers' compensation claims | $ 1,400,000 |  |
Period for continued vesting of outstanding equity awards upon termination of CEO without cause other than following a change in control, years | two years |  |
Share-based compensation accelerated expense | $ 5,600,000 |  |
Liabilities for indemnification obligations | 0 | $ 0 |
Payment required to CEO upon termination of employment without cause other than following change in control |  |  |
Payment Required Upon Termination Of Employment [Line Items] |  |  |
Employee agreement contingencies | 1,700,000 |  |
Payment required to officers upon termination of employment following change of control |  |  |
Payment Required Upon Termination Of Employment [Line Items] |  |  |
Employee agreement contingencies | 37,700,000 |  |
Employee healthcare insurance policy |  |  |
Payment Required Upon Termination Of Employment [Line Items] |  |  |
General insurance expense | 59,500,000 | 59,300,000 | $ 52,700,000
Estimated liability for healthcare claims | 5,500,000 | 5,000,000.0 |
Maximum | Employee healthcare insurance policy |  |  |
Payment Required Upon Termination Of Employment [Line Items] |  |  |
Retained claim liability per incident | $ 1,000,000 | $ 1,000,000 | $ 1,000,000

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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- Definition Carrying amount (including both current and noncurrent portions) of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Liability for amount due employees, in addition to wages and any other money that employers owe employees, when their employment ends through a layoff or other termination. For example, a company may provide involuntarily terminated employees with a lump sum payment equal to one week's salary for every year of employment. + References No definition available. + Details
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