Derivatives (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Commodity derivative assets	$ 17,252	$ 1,599
Commodity derivative liabilities	0	0
Commodity derivative assets - current	30,702	45,447
Commodity derivative assets - noncurrent	310	100
Commodity derivative liabilities - current	(29,651)	(23,167)
Commodity derivative liabilities - noncurrent	(825)	(339)
Commodity Contract
Derivatives, Fair Value [Line Items]
Commodity derivative assets	37,730	37,739
Commodity derivative liabilities	(38,545)	(43,971)
Cash collateral	1,351	28,273
Total	536	22,041
Commodity Contract \| Commodity derivative assets - current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	36,929	36,146
Commodity derivative liabilities	(7,578)	(18,972)
Cash collateral	1,351	28,273
Commodity derivative assets - current	30,702	45,447
Commodity Contract \| Commodity derivative assets - noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	311	140
Commodity derivative liabilities	(1)	(40)
Cash collateral	0	0
Commodity derivative assets - noncurrent	310	100
Commodity Contract \| Commodity derivative liabilities - current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	489	1,447
Commodity derivative liabilities	(30,140)	(24,614)
Cash collateral	0	0
Commodity derivative liabilities - current	(29,651)	(23,167)
Commodity Contract \| Commodity derivative liabilities - noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	1	6
Commodity derivative liabilities	(826)	(345)
Cash collateral	0	0
Commodity derivative liabilities - noncurrent	$ (825)	$ (339)

Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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Carrying amount as of the balance sheet date of the asset arising from commodity contracts such as futures contracts tied to the movement of a particular commodity, which are expected to be converted into cash or otherwise disposed of after a year or beyond the normal operating cycle, if longer.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement.

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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.

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