Property, Plant and Equipment (Tables)

3 Months Ended

Mar. 31, 2016

Public Utilities, Property, Plant and Equipment [Abstract]

Major Classifications Of Property, Plant And Equipment And Accumulated Depreciation [Text Block]

	March 31,				December 31,
In thousands	2016		2015		2015
Utility plant in service	$	2,760,188	$	2,676,280	$	2,745,485
Utility construction work in progress	51,014		34,048		39,288
Less: Accumulated depreciation	878,364		847,278		867,377
Utility plant, net	1,932,838		1,863,050		1,917,396
Non-utility plant in service	296,826		299,969		296,839
Non-utility construction work in progress	7,826		7,457		7,768
Less: Accumulated depreciation	40,823		35,976		39,340
Non-utility plant, net	263,829		271,450		265,267
Total property, plant, and equipment	$	2,196,667	$	2,134,500	$	2,182,663
Capital expenditures in accrued liabilities	$	8,424	$	8,451	$	8,985