Gas Reserves (tables)

3 Months Ended

Mar. 31, 2014

Gas Reserves Table [Abstract]

Gas Reserves Table [Text Block]

	March 31,				December 31,
In thousands	2014		2013		2013
Gas reserves, current	$	21,990	$	14,286	$	20,646
Gas reserves, non-current	156,450		110,033		140,573
Less: Accumulated amortization	21,556		9,864		18,575
Total gas reserves	156,884		114,455		142,644
Less: Deferred tax liabilities on gas reserves	30,704		32,907		42,117
Net investment in gas reserves	$	126,180	$	81,548	$	100,527