Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
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Amount of increase in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Nominal volume used to calculate payments on a derivative instrument.

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Amount, after premiums ceded to other entities and premiums assumed by the entity, of premiums earned.

+ 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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Derivative Instruments and Hedging Activities - Narrative (Details)		9 Months Ended		12 Months Ended
	Jan. 07, 2016 USD ($)	Sep. 30, 2017 bbl	Sep. 30, 2016 USD ($)	Dec. 31, 2016 bbl
Commodity contracts
Derivatives, Fair Value [Line Items]
Notional quantity (in bbl) \| bbl		128,000		2,589
Interest Rate Swaption
Derivatives, Fair Value [Line Items]
Premiums received			$ 630,000
Interest Rate Swaption \| Interest expense
Derivatives, Fair Value [Line Items]
Premiums received			$ 630,000
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional principal amount	$ 50,000,000
Fair value of derivatives \| Interest Rate Swap
Derivatives, Fair Value [Line Items]
Benefit from termination of position	$ 366,000