Gas Reserves (Tables)

6 Months Ended

Jun. 30, 2015

Gas Reserves Table [Abstract]

Gas Reserves Table [Text Block]

	June 30,				December 31,
In thousands	2015		2014		2014
Gas reserves, current	$	18,214	$	20,373	$	20,020
Gas reserves, non-current	169,288		157,535		167,190
Less: Accumulated amortization	47,933		27,255		37,910
Total gas reserves(1)	139,569		150,653		149,300
Less: Deferred tax liabilities on gas reserves	27,357		34,828		18,551
Net investment in gas reserves(1)	$	112,212	$	115,825	$	130,749