Derivative Financial Instruments Fair Value of Derivative and Balance Sheet Location (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 3,613	$ 4,728
Derivative Asset, Fair Value, Gross Asset	31,824	178,214
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	312	0
Derivative Asset, Fair Value, Gross Asset	28,078	84,492
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	2,921	3,364
Commodity Contract [Member] \| Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	27,766	84,492
Commodity Contract [Member] \| Non Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	3,746	93,722
Commodity Contract [Member] \| Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	529	748
Commodity Contract [Member] \| Non Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	692	1,364
Basis Protection Contracts Related to Natural Gas and Crude Oil Sales [Member] \| Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value of Derivatives	$ 2,392	$ 2,616

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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