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Asset Impairments	3 Months Ended
Asset Impairments	Mar. 31, 2016
Wexpro Impairment [Abstract]
Asset Impairments	Asset Impairments During the fourth quarter of 2015, Wexpro recorded a pre-tax abandonment and impairment charge of $12.1 million for the South Moxa leasehold because current market prices do not support a drilling program.