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Other Income and Other Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other income:    
Interest income $ 1,948 $ 3,277
Miscellaneous 3 8
Total other income 12,429 12,569
Other expense:    
Non-operating costs (1,937) (2,658)
Investment gains (losses) — net (343) 60
Miscellaneous (1,573) (2,186)
Total other expense (3,853) (4,784)
APS    
Other income:    
Interest income 1,481 2,341
Miscellaneous 1 8
Total other income 11,960 11,633
Other expense:    
Non-operating costs (1,778) (2,482)
Miscellaneous (1,572) (2,186)
Total other expense (3,350) (4,668)
SCR deferral    
Other income:    
Debt return on Four Corners SCR deferrals (Note 4) 4,086 3,140
SCR deferral | APS    
Other income:    
Debt return on Four Corners SCR deferrals (Note 4) 4,086 3,140
Ocotillo deferral    
Other income:    
Debt return on Four Corners SCR deferrals (Note 4) 6,392 6,144
Ocotillo deferral | APS    
Other income:    
Debt return on Four Corners SCR deferrals (Note 4) $ 6,392 $ 6,144