Gas Reserves (tables)

6 Months Ended

Jun. 30, 2014

Gas Reserves Table [Abstract]

Gas Reserves Table [Text Block]

	June 30,				December 31,
In thousands	2014		2013		2013
Gas reserves, current	$	20,373	$	15,324	$	20,646
Gas reserves, non-current	157,535		126,215		140,573
Less: Accumulated amortization	27,255		12,453		18,575
Total gas reserves	150,653		129,086		142,644
Less: Deferred tax liabilities on gas reserves	34,828		39,963		42,117
Net investment in gas reserves	$	115,825	$	89,123	$	100,527