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Inventories Inventories (Policies)	3 Months Ended
	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventory, Policy [Policy Text Block]	We utilize commodity derivatives to manage price volatility associated with its natural gas inventories. Changes in fair value of designated hedged inventory are recorded in inventory on our consolidated balance sheets and cost of products sold in our consolidated statements of operations.

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- References

No definition available.

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- Definition

Disclosure of inventory accounting policy for inventory classes, including, but not limited to, basis for determining inventory amounts, methods by which amounts are added and removed from inventory classes, loss recognition on impairment of inventories, and situations in which inventories are stated above cost.

+ References

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