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Commitments and Contingencies (Narrative) (Details) - Standby letters of credit related to various insurance contracts and foreign vendor commitments - Senior Secured Credit Facility - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Commitments And Contingencies [Line Items] |  |
Standby letters of credit for various insurance contracts and commitments to foreign vendors | $ 22,787 | $ 54,591
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 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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- Details
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- Details
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