Gas Reserves (Tables)

9 Months Ended

Sep. 30, 2015

Gas Reserves [Abstract]

Gas Reserves Table [Text Block]

	September 30,				December 31,
In thousands	2015		2014		2014
Gas reserves, current	$	17,822	$	21,455	$	20,020
Gas reserves, non-current	169,300		164,115		167,190
Less: Accumulated amortization	51,516		32,370		37,910
Total gas reserves(1)	135,606		153,200		149,300
Less: Deferred tax liabilities on gas reserves	23,042		33,037		18,551
Net investment in gas reserves(1)	$	112,564	$	120,163	$	130,749