STATEMENTS OF INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
|
| Interest charges and financing costs | ||||
| Other financing costs | $ 625 | $ 828 | $ 1,781 | $ 2,461 |