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Other Income and Other Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Other income: |  |  |  |
Interest income | $ 2,755 | $ 2,699 | $ 6,032 | $ 5,001
Investment gains (losses) - net | 2,826 | 0 | 2,826 | 0
Miscellaneous | 137 | 5 | 145 | 28
Total other income | 16,670 | 12,885 | 29,239 | 20,054
Other expense: |  |  |  |
Non-operating costs | (2,290) | (3,481) | (4,948) | (6,185)
Investment losses (gains) — net | 0 | (491) | 60 | (729)
Miscellaneous | (1,746) | (378) | (3,932) | (1,794)
Total other expense | (4,036) | (4,350) | (8,820) | (8,708)
APS |  |  |  |
Other income: |  |  |  |
Interest income | 2,183 | 1,504 | 4,524 | 3,054
Miscellaneous | 137 | 6 | 145 | 28
Total other income | 13,272 | 11,691 | 24,905 | 18,107
Other expense: |  |  |  |
Non-operating costs | (2,113) | (3,049) | (4,595) | (5,517)
Miscellaneous | (1,746) | (379) | (3,932) | (1,789)
Total other expense | (3,859) | (3,428) | (8,527) | (7,306)
SCR deferral |  |  |  |
Other income: |  |  |  |
Debt return on Four Corners SCR deferrals (Note 4) | 4,249 | 4,887 | 7,389 | 9,731
SCR deferral | APS |  |  |  |
Other income: |  |  |  |
Debt return on Four Corners SCR deferrals (Note 4) | 4,249 | 4,887 | 7,389 | 9,731
Ocotillo deferral |  |  |  |
Other income: |  |  |  |
Debt return on Four Corners SCR deferrals (Note 4) | 6,703 | 5,294 | 12,847 | 5,294
Ocotillo deferral | APS |  |  |  |
Other income: |  |  |  |
Debt return on Four Corners SCR deferrals (Note 4) | $ 6,703 | $ 5,294 | $ 12,847 | $ 5,294

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