Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2016

Public Utilities, Property, Plant and Equipment [Abstract]

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

	September 30,				December 31,
In thousands	2016		2015		2015
Utility plant in service	$	2,815,340	$	2,710,658	$	2,745,485
Utility construction work in progress	58,470		58,280		39,288
Less: Accumulated depreciation	899,851		867,281		867,377
Utility plant, net	1,973,959		1,901,657		1,917,396
Non-utility plant in service	298,586		296,169		296,839
Non-utility construction work in progress	4,800		7,891		7,768
Less: Accumulated depreciation	43,483		37,856		39,340
Non-utility plant, net	259,903		266,204		265,267
Total property, plant, and equipment	$	2,233,862	$	2,167,861	$	2,182,663
Capital expenditures in accrued liabilities	$	8,918	$	9,700	$	8,985