Property, Plant and Equipment (tables)

6 Months Ended

Jun. 30, 2011

Public Utilities Property Plant And Equipment Abstract

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

		June 30,				December 31,
Thousands		2011		2010		2010
Utility plant in service		$	2,281,407	$	2,218,660	$	2,247,952
Utility construction work in progress			32,814		30,086		29,324
Less: Accumulated depreciation			730,199		700,202		710,214
	Utility plant-net		1,584,022		1,548,544		1,567,062
Non-utility plant in service			290,035		66,862		290,038
Non-utility construction work in progress			7,891		167,218		9,088
Less: Accumulated depreciation			14,730		10,530		12,025
	Non-utility plant-net	$	283,196	$	223,550	$	287,101
Total property, plant and equipment		$	1,867,218	$	1,772,094	$	1,854,163