Derivatives (Current and Noncurrent Derivative Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Commodity derivative assets	$ 22,285	$ 17,252
Commodity derivative liabilities	0	0
Commodity derivative assets - current	51,421	30,702
Commodity derivative assets - noncurrent	480	310
Commodity derivative liabilities - current	(32,647)	(29,651)
Commodity derivative liabilities - noncurrent	(889)	(825)
Commodity Contract
Derivatives, Fair Value [Line Items]
Commodity derivative assets	44,658	37,730
Commodity derivative liabilities	(41,237)	(38,545)
Cash collateral	14,944	1,351
Total	18,365	536
Commodity Contract \| Commodity derivative assets - current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	43,463	36,929
Commodity derivative liabilities	(6,986)	(7,578)
Cash collateral	14,944	1,351
Commodity derivative assets - current	51,421	30,702
Commodity Contract \| Commodity derivative assets - noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	484	311
Commodity derivative liabilities	(4)	(1)
Cash collateral	0	0
Commodity derivative assets - noncurrent	480	310
Commodity Contract \| Commodity derivative liabilities - current
Derivatives, Fair Value [Line Items]
Commodity derivative assets	706	489
Commodity derivative liabilities	(33,353)	(30,140)
Cash collateral	0	0
Commodity derivative liabilities - current	(32,647)	(29,651)
Commodity Contract \| Commodity derivative liabilities - noncurrent
Derivatives, Fair Value [Line Items]
Commodity derivative assets	5	1
Commodity derivative liabilities	(894)	(826)
Cash collateral	0	0
Commodity derivative liabilities - noncurrent	$ (889)	$ (825)

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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