Property, Plant and Equipment (tables)

12 Months Ended

Dec. 31, 2012

Public Utilities, Property, Plant and Equipment [Abstract]

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

In thousands	2012		2011
Utility plant in service	$	2,435,886	$	2,323,467
Utility construction work in progress	46,831		36,051
Less: Accumulated depreciation	789,201		749,603
Utility plant, net	1,693,516		1,609,915
Non-utility plant in service	296,781		293,205
Non-utility construction work in progress	6,510		8,379
Less: Accumulated depreciation	23,195		17,623
Non-utility plant, net	280,096		283,961
Total property, plant, and equipment	$	1,973,612	$	1,893,876