Commitments and Contingencies (tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule Of Future Minimum Lease Payments For Operating And Capital Leases [Table Text Block]

In thousands	Operating leases		Capital leases		Minimum lease payments
2013	$	5,415	$	547	$	5,962
2014	5,655		335		5,990
2015	5,498		136		5,634
2016	5,478		42		5,520
2017	5,474		1		5,475
Thereafter	33,187		—		33,187
Total	$	60,707	$	1,061	$	61,768

Long-term Purchase Commitment [Table Text Block]

In thousands	Gas Purchase Agreements		Pipeline Capacity Purchase Agreements		Pipeline Capacity Release Agreements
2013	$	104,443	$	90,823	$	3,464
2014	12,166		86,119		—
2015	—		72,707		—
2016	—		61,398		—
2017	—		48,503		—
Thereafter	—		240,929		—
Total	116,609		600,479		3,464
Less: Amount representing interest	129		87,263		—
Total at present value	$	116,480	$	513,216	$	3,464