Gas Reserves (tables)

3 Months Ended

Mar. 31, 2013

Gas Reserves Table [Abstract]

Gas Reserves Table [Text Block]

	March 31,				December 31,
In thousands	2013		2012		2012
Gas reserves, current	$	14,286	$	6,732	$	14,966
Gas reserves, non-current	110,033		63,546		92,179
Less: Accumulated amortization	9,864		2,440		7,486
Total gas reserves	114,455		67,838		99,659
Less: Deferred taxes on gas reserves	32,907		22,047		28,329
Net investment in gas reserves	$	81,548	$	45,791	$	71,330