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Related Party Transactions - Railcar Lease Agreements and Maintenance (Details) - Railcar Lease Agreement - CVR Partners, LP - American Railcar Leasing LLC $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) railcar	Jun. 30, 2017 railcar	Mar. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Number of railcars leased | railcar	115
Number of railcars to be leased | railcar		70
Rent expense | $	$ 0.4		$ 0.2
Maintenance expense | $			$ 0.2

X

- Definition

Lessee Leasing Arrangements, Operating Lease Commitments, Number of Railcars to be Leased

+ References

No definition available.

+ Details

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X

- Definition

Lessee Leasing Arrangements, Operating Leases, Number of Railcars

+ References

No definition available.

+ Details

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X

- Definition

Maintenance costs incurred and are directly related to goods produced and sold during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ 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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- Details

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X

- Details

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- Details

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