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Property, Plant and Equipment Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Thousands		9 Months Ended
	Apr. 25, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Estimate of future asset retirement costs		$ 44,000		$ 42,900
Notes payable from acquisition		$ 4,875	$ 0
the Purchase Agreement [Member]
Business Acquisition [Line Items]
Total consideration in the purchase and sale agreement	$ 12,700
Installment notes payable	4,900
Estimated fair value of assets purchased	$ 12,700

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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The amount of asset retirement costs previously incurred and capitalized separately from the capitalized amount of the associated long-lived assets.

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