Property, Plant and Equipment (tables)

9 Months Ended

Sep. 30, 2013

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	2013		2012		2012
Utility plant in service	$	2,482,034	$	2,399,600	$	2,435,886
Utility construction work in progress	80,325		53,017		46,831
Less: Accumulated depreciation	818,644		776,812		789,201
Utility plant, net	1,743,715		1,675,805		1,693,516
Non-utility plant in service	296,022		296,486		296,781
Non-utility construction work in progress	7,479		6,626		6,510
Less: Accumulated depreciation	27,702		21,698		23,195
Non-utility plant, net	275,799		281,414		280,096
Total property, plant, and equipment	$	2,019,514	$	1,957,219	$	1,973,612