Balance Sheet Components

6 Months Ended

Jun. 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 June 30, 2020 and December 31, 2019 (dollars in thousands):

	June 30,		December 31,
	2020		2019
Materials and supplies	$	48,867	$	47,402
Fuel stock		5,208		4,875
Stored natural gas		13,258		14,306
Total	$	67,333	$	66,583

Other Current Assets

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

	June 30,		December 31,
	2020		2019
Collateral posted for derivative instruments after netting with outstanding derivative liabilities	$	—	$	4,434
Prepayments		21,813		19,652
Income taxes receivable		1,941		11,047
Other		18,608		5,009
Total	$	42,362	$	40,142

Net Utility Property

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

	June 30,		December 31,
	2020		2019
Utility plant in service	$	6,613,219	$	6,462,993
Construction work in progress		195,937		164,941
Total		6,809,156		6,627,934
Less: Accumulated depreciation and amortization		1,926,023		1,830,927
Total net utility property	$	4,883,133	$	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 June 30, 2020 and December 31, 2019 (dollars in thousands):

	June 30,		December 31,
	2020		2019
Operating lease ROU assets	$	72,588	$	69,746
Finance lease ROU assets		49,159		50,980
Non-utility property		26,774		27,159
Equity investments		51,748		51,258
Investment in affiliated trust		11,547		11,547
Notes receivable		16,375		14,060
Deferred compensation assets		8,435		8,948
Other		25,842		23,394
Total	$	262,468	$	257,092

Other Current Liabilities

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

	June 30, 2020		December 31, 2019
Accrued taxes other than income taxes	$	38,734	$	36,965
Employee paid time off accruals		25,728		22,343
Accrued interest		16,226		16,486
Current portion of pensions and other postretirement benefits		11,700		8,826
Income taxes payable		—		298
Derivative liabilities		3,064		10,928
Other current liabilities		27,806		35,133
Total other current liabilities	$	123,258	$	130,979

Other Non-Current Liabilities and Deferred Credits

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

	June 30, 2020		December 31, 2019
Operating lease liabilities	$	70,330	$	65,565
Finance lease liabilities		50,283		51,750
Deferred investment tax credits		30,162		30,444
Asset retirement obligations		20,236		20,338
Derivative liabilities		67,038		19,685
Other		13,441		13,407
Total	$	251,490	$	201,189

Regulatory Assets and Liabilities

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

	June 30, 2020				December 31, 2019
	Current		Non-Current		Current		Non-Current
Regulatory Assets
Energy commodity derivatives	$	309	$	—	$	6,310	$	264
Decoupling surcharge		10,345		18,514		12,098		14,806
Pension and other postretirement benefit plans		—		203,471		—		208,754
Interest rate swaps		—		244,672		—		168,594
Deferred income taxes		—		98,879		—		95,752
Settlement with Coeur d'Alene Tribe		—		40,677		—		41,332
AFUDC above FERC allowed rate		—		41,912		—		40,749
Demand side management programs		—		6,538		—		12,170
Utility plant to be abandoned		—		30,700		—		31,291
Other regulatory assets		523		66,727		3,443		57,090
Total regulatory assets	$	11,177	$	752,090	$	21,851	$	670,802
Regulatory Liabilities
Income tax related liabilities	$	13,335	$	400,564	$	23,803	$	407,549
Deferred natural gas costs		2,778		—		3,189		—
Deferred power costs		21,692		20,112		14,155		23,544
Decoupling rebate		796		3,359		255		2,398
Provision for rate refund (Washington remand case)		7,339		—		3,565		—
Utility plant retirement costs		—		322,138		—		312,403
Interest rate swaps		—		15,773		—		17,088
Other regulatory liabilities		3,689		16,880		6,748		12,454
Total regulatory liabilities	$	49,629	$	778,826	$	51,715	$	775,436