SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

12 Months Ended

Dec. 31, 2014

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Schedule of activities in the allowance for doubtful accounts

	2014			2013			2012
Beginning Balance	$	668		$	714		$	669
Provision for uncollectible accounts		1,561			1,469			1,548
Net write off of uncollectible accounts		(1,532	)		(1,515	)		(1,503	)
Ending Balance	$	697		$	668		$	714

Schedule of depreciable plant and equipment

	2014		2013
Equipment	$	487,845	$	443,439
Office buildings and other structures		194,905		179,023
Transmission and distribution plant		1,508,444		1,420,952
Total	$	2,191,194	$	2,043,414

Schedule of estimated useful lives of depreciable plant and equipment

	Useful Lives
Equipment	5 to 50 years
Transmission and distribution plant	40 to 65 years
Office Buildings and other structures	50 years

Schedule of regulatory assets and liabilities

	2014		2013
Regulatory Assets
Pension and retiree group health	$	245,008	$	119,868
Property-related temporary differences (tax benefits flowed through to ratepayers)		72,350		60,780
Other accrued benefits		32,959		43,061
Interim rates long-term accounts receivable		10,627		—
Net WRAM and MCBA long-term accounts receivable		14,449		15,423
Asset retirement obligations, net		13,863		12,549
Health care balancing account		1,075		—
Total Regulatory Assets	$	390,331	$	251,681
Regulatory Liabilities
Future tax benefits due ratepayers	$	26,114	$	24,195
Conservation program		2,669		6,291
Pension balancing account		4,291		—
Other liabilities		3,373		3,765
Total Regulatory Liabilities	$	36,447	$	34,251

Schedule of SARs which were dilutive

	2014		2013		2012
	(In thousands, except per share data)
Net income as reported and available to common stockholders	$	56,738	$	47,254	$	48,828
Weighted average common shares, basic		47,791		46,384		41,892
Dilutive common stock equivalents (treasury method)		38		33		—
Shares used for dilutive calculation		47,829		46,417		41,892
Earnings per share—basic	$	1.19	$	1.02	$	1.17
Earnings per share—diluted	$	1.19	$	1.02	$	1.17