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Physical Delivery Contracts and Gas Derivatives (Details 1) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Commodity derivative contracts:
Current assets	$ 604
Non-current assets	487
Current liabilities		1,341
Non-current liabilities		$ 591

Fair value, after the effects of master netting arrangements, of a 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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