Property, Plant and Equipment (tables)

9 Months Ended

Sep. 30, 2011

Public Utilities Property Plant And Equipment Abstract

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

		September 30,				December 31,
Thousands		2011		2010		2010
Utility plant in service		$	2,296,788	$	2,222,222	$	2,247,952
Utility construction work in progress			36,459		33,359		29,324
Less: Accumulated depreciation			740,378		700,193		710,214
	Utility plant-net		1,592,869		1,555,388		1,567,062
Non-utility plant in service			290,075		66,299		290,038
Non-utility construction work in progress			9,176		206,823		9,088
Less: Accumulated depreciation			16,214		10,853		12,025
	Non-utility plant-net	$	283,037	$	262,269	$	287,101
Total property, plant and equipment		$	1,875,906	$	1,817,657	$	1,854,163