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Discontinued Operations (Details) - Canadian Abraxas Petroleum, UCL - USD ($) $ in Millions	10 Months Ended	12 Months Ended
	Oct. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale		$ 1.9
Revenue			$ 2.0
Net loss	$ (0.6)

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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