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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jun. 30, 2016
Laramie Energy Company
Schedule of Equity Method Investments [Line Items]
Other than temporary impairment charge	$ 0	$ 0	$ 41,081
5% Convertible Senior Notes due 2021
Schedule of Equity Method Investments [Line Items]
Debt instrument, interest rate	5.00%			5.00%
7.75% Senior Secured Note due 2025
Schedule of Equity Method Investments [Line Items]
Debt instrument, interest rate	7.75%

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For investments in debt and equity securities accounted for at cost, the excess of the carrying amount over net sale proceeds of investments disposed of during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 225
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
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-Section S99
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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Section S99
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