Derivative Instruments and Fair Value Measurements - Use of Derivative Instruments (Details) - Commodity Contract - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	$ 240	$ 162
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	240	162
Other Assets
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	0	0
Current Liabilities
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	236	139
Less counterparty offsets	0	0
As reported fair value contracts	236	139
Other Liabilities
Derivatives, Fair Value [Line Items]
Asset derivatives	0	0
Liability derivatives	0	0
Less counterparty offsets	0	0
As reported fair value contracts	$ 0	$ 0

Fair value of liability associated with 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.

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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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Fair value, after effects of master netting arrangements, of 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 offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after effects of master netting arrangements, of financial liability or 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 offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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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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Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps.

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Carrying amount as of the balance sheet date of the asset arising from energy trading activities that involves the purchase and sale of energy under forward contracts at fixed and variable prices and the buying and selling of financial energy contracts that include exchange futures and options and over the counter options and swaps, 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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