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Summary of Significant Accounting Policies - Property, Plant, and Equipment (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($)
Property, Plant, and Equipment |
Minimum project cost required for capitalization of interest | $ 1,000,000.0
Minimum period required for completion of project for capitalization of interest | 6 months
Aircraft |
Property, Plant, and Equipment |
Useful life | 20 years
Minimum | Improvements to land |
Property, Plant, and Equipment |
Useful life | 15 years
Minimum | Buildings |
Property, Plant, and Equipment |
Useful life | 20 years
Minimum | Machinery and equipment |
Property, Plant, and Equipment |
Useful life | 5 years
Minimum | Automotive equipment |
Property, Plant, and Equipment |
Useful life | 5 years
Minimum | Furniture and fixtures |
Property, Plant, and Equipment |
Useful life | 3 years
Minimum | Railcars |
Property, Plant, and Equipment |
Useful life | 25 years
Maximum | Improvements to land |
Property, Plant, and Equipment |
Useful life | 30 years
Maximum | Buildings |
Property, Plant, and Equipment |
Useful life | 30 years
Maximum | Machinery and equipment |
Property, Plant, and Equipment |
Useful life | 30 years
Maximum | Automotive equipment |
Property, Plant, and Equipment |
Useful life | 15 years
Maximum | Furniture and fixtures |
Property, Plant, and Equipment |
Useful life | 10 years
Maximum | Railcars |
Property, Plant, and Equipment |
Useful life | 30 years

X
- Definition Represents the minimum period required for completion of project for capitalization of interest to project cost. + References No definition available. + Details
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- Definition Represents the minimum amount of project cost required for capitalization of interest to project cost. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Details
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- Details
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