Derivative Instruments (tables)

12 Months Ended

Dec. 31, 2013

Summary of Derivative Instruments [Abstract]

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

	At December 31,
In thousands	2013		2012
Natural gas (in therms):
Financial	389,225		395,820
Physical	552,500		398,250
Foreign exchange	$	15,002	$	13,231

Income Statement Presentation of Derivative Instruments [Text Block]

	December 31, 2013						December 31, 2012
In thousands	Natural gas commodity			Foreign exchange			Natural gas commodity			Foreign exchange
Benefit (expense) to cost of gas	$	4,985		$	(300	)	$	(5,850	)	$	65
Less:
Amounts deferred to regulatory accounts on balance sheet	(4,964		)	300			5,850			(65		)
Total gain in pre-tax earnings	$	21		$	—		$	—		$	—