Derivative Instruments (tables)

3 Months Ended

Mar. 31, 2014

Summary of Derivative Instruments [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

	March 31,				December 31,
In thousands	2014		2013		2013
Natural gas (in therms):
Financial	295,125		302,020		389,225
Physical	875,150		671,000		552,500
Foreign exchange	$	5,590	$	16,322	$	15,002

Income Statement Presentation of Derivative Instruments [Text Block]

	Three months ended March 31,
	2014						2013
In thousands	Natural gas commodity			Foreign currency			Natural gas commodity			Foreign currency
Benefit (expense) to cost of gas	$	15,912		$	(275	)	$	7,183		$	(239	)
Less:
Amounts deferred to regulatory accounts on the balance sheet	(15,875		)	275			(7,037		)	239
Total gain in pre-tax earnings	$	37		$	—		$	146		$	—