Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets [Table Text Block]

The regulatory assets and regulatory liabilities resulting from our application of the provisions of Topic 980, included in the accompanying Consolidated Balance Sheet at December 31, 2021 and 2020 are as follows (in thousands):

Regulatory Assets	2021		2020
Current regulatory assets:
Fuel cost	$	61,312	$	34,149
Electric power cost	25,961		7,826
ARO	16,029		16,029
Deferred cash out	6,192		—
Asset retirement costs - Eminence	4,857		4,857
Total current regulatory assets	114,351		62,861
Non-current regulatory assets:
ARO	126,270		123,436
Deferred cash out	41,082		70,023
Grossed-up deferred taxes on equity funds used during construction	34,660		36,089
Asset retirement costs - Eminence	27,788		31,741
Slug Catcher	6,292		6,429
Other	16,989		14,152
Total non-current regulatory assets	253,081		281,870
Total regulatory assets	$	367,432	$	344,731

Schedule of Regulatory Liabilities [Table Text Block]

Regulatory Liabilities	2021		2020
Current regulatory liabilities:
Deferred taxes - liability	$	31,521	$	31,521
Postretirement benefits other than pension	15,000		15,000
Pension	10,394		10,394
Sentinel meter station depreciation	102		102
Other	352		69
Total current regulatory liabilities	57,369		57,086
Non-current regulatory liabilities:
Negative salvage	533,815		504,465
Deferred taxes - liability	330,502		361,254
Postretirement benefits other than pension	35,532		45,879
Pension	24,126		28,520
Sentinel meter station depreciation	6,814		6,656
Other	1,312		—
Total non-current regulatory liabilities	932,101		946,774
Total regulatory liabilities	$	989,470	$	1,003,860