Other Income, Net
Other income, net consisted of the following: | | | | | | | | | | | | | | | | | | Three Months Ended Sept. 30 | | Nine Months Ended Sept. 30 | (Thousands of Dollars) | 2017 | | 2016 | | 2017 | | 2016 | Interest income | $ | 296 |
| | $ | 400 |
| | $ | 488 |
| | $ | 579 |
| Other nonoperating income | 1 |
| | — |
| | — |
| | 16 |
| Insurance policy expense | (12 | ) | | (32 | ) | | (36 | ) | | (32 | ) | Other nonoperating expense | — |
| | (231 | ) | | — |
| | — |
| Other income, net | $ | 285 |
| | $ | 137 |
| | $ | 452 |
| | $ | 563 |
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