Balance Sheet Components Balance Sheet Components (Notes)

12 Months Ended

Dec. 31, 2019

Balance Sheet Components [Abstract]

Supplemental Balance Sheet Disclosures [Text Block]

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 December 31 (dollars in thousands):

	2019		2018
Materials and supplies	$	47,402	$	47,403
Fuel stock	4,875		4,869
Stored natural gas	14,306		11,609
Total	$	66,583	$	63,881

Other Current Assets

Other current assets consisted of the following as of December 31 (dollars in thousands):

	2019		2018
Collateral posted for derivative instruments after netting with outstanding derivative liabilities	$	4,434	$	26,809
Prepayments	19,652		17,536
Income taxes receivable	11,047		822
Other	5,009		8,843
Total	$	40,142	$	54,010

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 December 31 (dollars in thousands):

	2019		2018
Operating lease ROU assets	$	69,746	$	—
Finance lease ROU assets	50,980		—
Non-utility property	27,159		31,355
Equity investments	51,258		29,257
Investment in affiliated trust	11,547		11,547
Notes receivable	14,060		11,073
Deferred compensation assets	8,948		8,400
Other	23,394		23,065
Total	$	257,092	$	114,697

Other Current Liabilities

Other current liabilities consisted of the following as of December 31 (dollars in thousands):

	2019		2018
Accrued taxes other than income taxes	$	36,965	$	36,858
Unsettled interest rate swap derivative liabilities	7,825		—
Employee paid time off accruals	22,343		20,992
Accrued interest	16,486		16,704
Pensions and other postretirement benefits	8,826		9,151
Utility energy commodity derivative liabilities	3,103		3,908
Other	35,431		32,745
Total	$	130,979	$	120,358

Other Non-Current Liabilities and Deferred Credits

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

	2019		2018
Operating lease liabilities	$	65,565	$	—
Finance lease liabilities	51,750		—
Deferred investment tax credits	30,444		29,725
Asset retirement obligations	20,338		18,266
Derivative liabilities	19,685		10,300
Other	13,407		12,740
Total	$	201,189	$	71,031