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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments And Contingencies Disclosure [Abstract] |
Schedule of Future Minimum Annual Commitments Under Operating Leases | The Company is obligated under certain operating leases and rental agreements for railroad cars, office space, and other equipment. Certain lease agreements contain escalation clauses and are accounted for on a straight-line basis over the lease term. Future minimum annual commitments under such operating leases at December 31, 2017 are as follows:
Twelve months ending December 31, |  |  |  |
2018 |  | $ | 14,891 |
2019 |  |  | 11,254 |
2020 |  |  | 7,569 |
2021 |  |  | 5,827 |
2022 |  |  | 2,614 |
Thereafter |  |  | 15,582 |

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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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