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Other Income and Other Expense | 9 Months Ended
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Sep. 30, 2018
Component of Other Income and Other Expense Nonoperating [Line Items] |
Other Income and Other Expense | Other Income and Other Expense The following table provides detail of Pinnacle West's Consolidated other income and other expense for the three and nine months ended September 30, 2018 and 2017 (dollars in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Other income: |  |  |  |  |  |  |  |  |  |  |
Interest income | $ | 1,957 |  |  | $ | 917 |  |  | $ | 6,256 |  |  | $ | 1,782 |
Debt return on Four Corners SCR deferral (Note 4) | 4,910 |  |  | — |  |  | 11,190 |  |  | — |
Miscellaneous | 91 |  |  | 174 |  |  | 95 |  |  | 273 |
Total other income | $ | 6,958 |  |  | $ | 1,091 |  |  | $ | 17,541 |  |  | $ | 2,055 |
Other expense: |  |  |  |  |  |  |  |  |  |  |
Non-operating costs | $ | (2,480 | ) |  | $ | (1,978 | ) |  | $ | (7,404 | ) |  | $ | (7,338 | )
Investment losses — net | — |  |  | (231 | ) |  | (268 | ) |  | (759 | )
Miscellaneous | (2,583 | ) |  | (2,784 | ) |  | (4,391 | ) |  | (4,398 | )
Total other expense | $ | (5,063 | ) |  | $ | (4,993 | ) |  | $ | (12,063 | ) |  | $ | (12,495 | )
APS |
Component of Other Income and Other Expense Nonoperating [Line Items] |
Other Income and Other Expense | The following table provides detail of APS’s other income and other expense for the three and nine months ended September 30, 2018 and 2017 (dollars in thousands):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Other income: |  |  |  |  |  |  |  |  |  |  |
Interest income | $ | 1,151 |  |  | $ | 683 |  |  | $ | 4,874 |  |  | $ | 1,278 |
Debt return on Four Corners SCR deferral (Note 4) | 4,910 |  |  | — |  |  | 11,190 |  |  | — |
Miscellaneous | 92 |  |  | 55 |  |  | 96 |  |  | 154 |
Total other income | $ | 6,153 |  |  | $ | 738 |  |  | $ | 16,160 |  |  | $ | 1,432 |
Other expense: |  |  |  |  |  |  |  |  |  |  |
Non-operating costs | $ | (2,334 | ) |  | $ | (1,734 | ) |  | $ | (6,931 | ) |  | $ | (6,625 | )
Miscellaneous | (1,027 | ) |  | (444 | ) |  | (2,748 | ) |  | (1,983 | )
Total other expense | $ | (3,361 | ) |  | $ | (2,178 | ) |  | $ | (9,679 | ) |  | $ | (8,608 | )

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