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Subsequent Events - Narrative (Details) - USD ($) $ in Thousands						12 Months Ended
	Feb. 28, 2018	Jan. 09, 2018	Jul. 31, 2015	May 29, 2015	Mar. 09, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Mar. 01, 2016	Feb. 29, 2016	Jul. 30, 2015	May 28, 2015
Subsequent Event [Line Items]
Investment in Laramie Energy, LLC						$ 0	$ 55,000	$ 27,529
CHS Acquisition | Subsequent Event
Subsequent Event [Line Items]
Payments to acquire businesses		$ 70,000
Laramie Energy Company
Subsequent Event [Line Items]
Investment in Laramie Energy, LLC				$ 13,800	$ 13,800
Ownership of Laramie Energy, LLC			32.40%	34.00%		42.30%			42.30%	32.40%	34.00%	33.34%
Laramie Energy Company | Subsequent Event
Subsequent Event [Line Items]
Ownership of Laramie Energy, LLC	39.14%
Laramie Energy Company | Unaffiliated Third Party
Subsequent Event [Line Items]
Investment in Laramie Energy, LLC			$ 19,000
Laramie Energy Company | Unaffiliated Third Party | Subsequent Event
Subsequent Event [Line Items]
Investment in Laramie Energy, LLC	$ 23,500
Equity method investments, fair value	$ 28,100
Shares issued (in shares)	70,227

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
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+ References

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(29))
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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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