Property, Plant and Equipment (tables)

6 Months Ended

Jun. 30, 2012

Public Utilities Property Plant And Equipment Abstract

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

		June 30,				December 31,
Thousands		2012		2011		2011
Utility plant in service		$	2,363,061	$	2,281,407	$	2,323,467
Utility construction work in progress			54,039		32,814		36,051
Less: Accumulated depreciation			770,825		730,199		749,603
	Utility plant-net		1,646,275		1,584,022		1,609,915
Non-utility plant in service			296,619		290,035		293,205
Non-utility construction work in progress			6,318		7,891		8,379
Less: Accumulated depreciation			20,196		14,730		17,623
	Non-utility plant-net		282,741		283,196		283,961
Total property, plant and equipment		$	1,929,016	$	1,867,218	$	1,893,876