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Other Income and Other Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Other income: |  |  |  |
Interest income | $ 2,408 | $ 387 | $ 4,299 | $ 864
Debt return on Four Corners SCR deferral (Note 4) | 4,188 | 0 | 6,280 | 0
Miscellaneous | 2 | 97 | 4 | 100
Total other income | 6,598 | 484 | 10,583 | 964
Other expense: |  |  |  |
Non-operating costs | (3,278) | (3,401) | (4,924) | (5,360)
Investment losses — net | (174) | (227) | (350) | (528)
Miscellaneous | (319) | (194) | (1,726) | (1,614)
Total other expense | (3,771) | (3,822) | (7,000) | (7,502)
APS |  |  |  |
Other income: |  |  |  |
Interest income | 2,046 | 257 | 3,724 | 596
Debt return on Four Corners SCR deferral (Note 4) | 4,188 | 0 | 6,280 | 0
Miscellaneous | 1 | 95 | 3 | 98
Total other income | 6,235 | 352 | 10,007 | 694
Other expense: |  |  |  |
Non-operating costs | (3,057) | (3,149) | (4,596) | (4,899)
Miscellaneous | (315) | (152) | (1,722) | (1,530)
Total other expense | $ (3,372) | $ (3,301) | $ (6,318) | $ (6,429)

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