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Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Commitments And Contingencies [Line Items] |  |  |
Rent expense under operating leases | $ 143,513 | $ 145,176 | $ 125,103
Standby letters of credit related to various insurance contracts and foreign vendor commitments | Senior Secured Credit Facility |  |  |
Commitments And Contingencies [Line Items] |  |  |
Standby letters of credit for various insurance contracts and commitments to foreign vendors | $ 54,591 | $ 56,267 |
Standby letters of credit related to various insurance contracts and foreign vendor commitments | Senior Secured Credit Facility | Maximum |  |  |
Commitments And Contingencies [Line Items] |  |  |
Expiration period for standby letters of credit | 2 years |  |

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- Definition Commitments and contingencies [line items] + References No definition available. + Details
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- Definition Debt Instrument, Term of Instrument + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 + Details
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- Details
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