Derivative Instruments (tables)

6 Months Ended

Jun. 30, 2014

Summary of Derivative Instruments [Abstract]

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

	June 30,				December 31,
In thousands	2014		2013		2013
Natural gas (in therms):
Financial	297,925		359,135		389,225
Physical	241,150		322,675		552,500
Foreign exchange	$	10,844	$	17,171	$	15,002

Income Statement Presentation of Derivative Instruments [Text Block]

	Three months ended June 30,
	2014						2013
In thousands	Natural gas commodity			Foreign currency			Natural gas commodity			Foreign currency
Benefit (expense) to cost of gas	$	(5,379	)	$	454		$	(16,139	)	$	(274	)
Less:
Amounts deferred to regulatory accounts on the balance sheet	5,223			(454		)	16,069			274
Total loss in pre-tax earnings	$	(156	)	$	—		$	(70	)	$	—

	Six months ended June 30,
	2014						2013
In thousands	Natural gas commodity			Foreign currency			Natural gas commodity			Foreign currency
Benefit (expense) to cost of gas	$	10,533		$	179		$	(8,956	)	$	(513	)
Less:
Amounts deferred to regulatory accounts on the balance sheet	(10,652		)	(179		)	9,032			513
Total gain (loss) in pre-tax earnings	$	(119	)	$	—		$	76		$	—