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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of increase in the fair value of derivatives recognized in the income statement.

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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.

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Derivative Instruments and Hedging Activities - Narrative (Details)		3 Months Ended		9 Months Ended
	Jan. 07, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) bbl	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Commodity contracts
Derivatives, Fair Value [Line Items]
Notional quantity (in bbl) \| bbl				441,000,000
Interest Rate Swaption
Derivatives, Fair Value [Line Items]
Premiums received		$ 0	$ 750,000	$ 630,000	$ 2,495,000
Interest Rate Swaption \| Interest expense
Derivatives, Fair Value [Line Items]
Premiums received		$ 0	$ 750,000	$ 630,000	$ 2,495,000
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]
Derivative Liabilities						$ 206,000
Benefit from termination of position	$ 160,000