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Other Income and Other Expense (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Other income: |  |
Interest income | $ 3,277 | $ 2,302
Miscellaneous | 8 | 23
Total other income | 12,569 | 7,169
Other expense: |  |
Non-operating costs | (2,658) | (2,704)
Non-operating costs | 60 | (238)
Miscellaneous | (2,186) | (1,416)
Total other expense | (4,784) | (4,358)
APS |  |
Other income: |  |
Interest income | 2,341 | 1,550
Miscellaneous | 8 | 22
Total other income | 11,633 | 6,416
Other expense: |  |
Non-operating costs | (2,482) | (2,467)
Miscellaneous | (2,186) | (1,411)
Total other expense | (4,668) | (3,878)
SCR deferral |  |
Other income: |  |
Debt return on Four Corners SCR deferrals (Note 4) | 3,140 | 4,844
SCR deferral | APS |  |
Other income: |  |
Debt return on Four Corners SCR deferrals (Note 4) | 3,140 | 4,844
Ocotillo deferral |  |
Other income: |  |
Debt return on Four Corners SCR deferrals (Note 4) | 6,144 | 0
Ocotillo deferral | APS |  |
Other income: |  |
Debt return on Four Corners SCR deferrals (Note 4) | $ 6,144 | $ 0

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