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Gas Reserves (Tables)

9 Months Ended

Sep. 30, 2016

Gas Reserves [Abstract]

Gas Reserves Table [Text Block]



		September 30,								December 31,
In thousands		2016				2015				2015
Gas reserves, current		$	16,257			$	17,822			$	17,094
Gas reserves, non-current		171,280				169,300				170,453
Less: Accumulated amortization		67,304				51,516				55,901
Total gas reserves⁽¹⁾		120,233				135,606				131,646
Less: Deferred taxes on gas reserves		25,799				23,042				27,203
Net investment in gas reserves		$	94,434			$	112,564			$	104,443