Balance Sheet Components

9 Months Ended

Sep. 30, 2020

Balance Sheet Related Disclosures [Abstract]

NOTE 3. BALANCE SHEET COMPONENTS

Materials and Supplies, Fuel Stock and Stored Natural Gas

Inventories of materials and supplies, fuel stock and stored natural gas are recorded at average cost for our regulated operations and the lower of cost or market for our non-regulated operations and consisted of the following as of September 30, 2020 and December 31, 2019 (dollars in thousands):

	September 30,		December 31,
	2020		2019
Materials and supplies	$	50,599	$	47,402
Fuel stock		4,919		4,875
Stored natural gas		13,508		14,306
Total	$	69,026	$	66,583

Other Current Assets

Other current assets consisted of the following as of September 30, 2020 and December 31, 2019 (dollars in thousands):

	September 30,		December 31,
	2020		2019
Collateral posted for derivative instruments after netting with outstanding derivative liabilities	$	—	$	4,434
Prepayments		15,078		19,652
Income taxes receivable		6,951		11,047
Other		4,548		5,009
Total	$	26,577	$	40,142

Net Utility Property

Net utility property consisted of the following as of September 30, 2020 and December 31, 2019 (dollars in thousands):

	September 30,		December 31,
	2020		2019
Utility plant in service	$	6,677,671	$	6,462,993
Construction work in progress		209,098		164,941
Total		6,886,769		6,627,934
Less: Accumulated depreciation and amortization		1,956,410		1,830,927
Total net utility property	$	4,930,359	$	4,797,007

Other Property and Investments-Net and Other Non-Current Assets

Other property and investments-net and other non-current assets consisted of the following as of September 30, 2020 and December 31, 2019 (dollars in thousands):

	September 30,		December 31,
	2020		2019
Operating lease ROU assets	$	71,972	$	69,746
Finance lease ROU assets		48,249		50,980
Non-utility property		22,397		27,159
Equity investments		56,448		51,258
Investment in affiliated trust		11,547		11,547
Notes receivable		14,265		14,060
Deferred compensation assets		9,030		8,948
Other		29,235		23,394
Total	$	263,143	$	257,092

Other Current Liabilities

Other current liabilities consisted of the following as of September 30, 2020 and December 31, 2019 (dollars in thousands):

	September 30, 2020		December 31, 2019
Accrued taxes other than income taxes	$	41,136	$	36,965
Employee paid time off accruals		25,796		22,343
Accrued interest		29,608		16,486
Current portion of pensions and other postretirement benefits		9,202		8,826
Derivative liabilities		4,398		10,928
Other current liabilities		30,100		35,431
Total other current liabilities	$	140,240	$	130,979

Other Non-Current Liabilities and Deferred Credits

Other non-current liabilities and deferred credits consisted of the following as of September 30, 2020 and December 31, 2019 (dollars in thousands):

	September 30, 2020		December 31, 2019
Operating lease liabilities	$	70,758	$	65,565
Finance lease liabilities		49,549		51,750
Deferred investment tax credits		30,021		30,444
Asset retirement obligations		19,743		20,338
Derivative liabilities		56,498		19,685
Other		13,901		13,407
Total	$	240,470	$	201,189

Regulatory Assets and Liabilities

Regulatory assets and liabilities consisted of the following as of September 30, 2020 and December 31, 2019 (dollars in thousands):

	September 30, 2020				December 31, 2019
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	—	$	—	$	6,310	$	264
Decoupling surcharge		8,414		16,742		12,098		14,806
Pension and other postretirement benefit plans		—		200,829		—		208,754
Interest rate swaps		—		232,088		—		168,594
Deferred income taxes		—		99,289		—		95,752
Settlement with Coeur d'Alene Tribe		—		40,349		—		41,332
AFUDC above FERC allowed rate		—		44,504		—		40,749
Demand side management programs		—		4,147		—		12,170
Utility plant to be abandoned		—		27,200		—		31,291
Other regulatory assets		2,780		72,393		3,443		57,090
Total regulatory assets	$	11,194	$	737,541	$	21,851	$	670,802
Regulatory Liabilities
Income tax related liabilities	$	13,598	$	397,082	$	23,803	$	407,549
Deferred natural gas costs		—		—		3,189		—
Deferred power costs		22,384		17,166		14,155		23,544
Decoupling rebate		1,663		2,583		255		2,398
Provision for rate refund (Washington remand case)		5,967		—		3,565		—
Utility plant retirement costs		—		322,129		—		312,403
Interest rate swaps		—		15,409		—		17,088
Other regulatory liabilities		5,290		19,272		6,748		12,454
Total regulatory liabilities	$	48,902	$	773,641	$	51,715	$	775,436