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Balance Sheet Components Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2018

Schedule of Inventory, Current [Table Text Block]

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):



	2018		2017
Materials and supplies	$	47,403	$	41,493
Fuel stock	4,869		4,843
Stored natural gas	11,609		11,739
Total	$	63,881	$	58,075

Schedule of Other Current Assets [Table Text Block]

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



	2018		2017
Collateral posted for derivative instruments	$	26,809	$	12,020
Prepayments	17,536		11,782
Other	9,665		9,071
Total	$	54,010	$	32,873

Schedule of Other Assets, Noncurrent [Table Text Block]

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



	2018		2017
Non-utility property	$	31,355	$	28,340
Equity investments	29,257		22,134
Investment in affiliated trust	11,547		11,547
Notes receivable	11,073		9,560
Deferred compensation assets	8,400		8,458
Other	23,065		21,278
Total	$	114,697	$	101,317

Other Current Liabilities [Table Text Block]

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



	2018		2017
Accrued taxes other than income taxes	$	36,858	$	33,802
Unsettled interest rate swap derivative liabilities	—		34,447
Employee paid time off accruals	20,992		20,330
Accrued interest	16,704		16,351
Pensions and other postretirement benefits	9,151		11,544
Utility energy commodity derivative liabilities	3,908		8,848
Other	32,745		33,791
Total	$	120,358	$	159,113

Other Noncurrent Liabilities [Table Text Block]

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



	2018		2017
Deferred investment tax credits	$	29,725	$	30,266
Asset retirement obligations	18,266		17,482
Derivative liabilities	10,300		10,456
Other	12,740		14,911
Total	$	71,031	$	73,115