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Earnings per Share/Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Capital stock |  |  |  |  |  |  |
Options outstanding (in shares) | 0 |  |  | 0 |  | 0 | 0
Sale of stock, number of shares issued in transaction (in shares) | 335,449 |  |  |  |  | 791,097 |
Sale of stock, consideration received on transaction | $ 27,000 |  |  |  |  | $ 60,000 |
Payments for commissions | $ 400 |  |  |  |  | $ 900 |
Issuances of Common Shares under stock-based compensation plans (in shares) |  |  |  |  |  | 25,164 | 18,351
Payment, tax withholding, share-based payment arrangement |  |  |  |  |  | $ 1,142 | $ 913
Dividends paid |  |  |  |  |  | $ 49,384 | $ 45,294
Dividends declared per common share (in dollars per share) | $ 0.4655 |  |  | $ 0.4300 |  | $ 1.3255 | $ 1.2250
Issuance of Common Shares from an at-the-market program, net of issuance costs | $ 26,881 | $ 16,724 | $ 15,584 |  |  |  |
Parent Company |  |  |  |  |  |  |
Capital stock |  |  |  |  |  |  |
Dividends paid | 17,500 |  |  | $ 15,900 |  | $ 49,400 | $ 45,300
GSWC |  |  |  |  |  |  |
Capital stock |  |  |  |  |  |  |
Payment, tax withholding, share-based payment arrangement |  |  |  |  |  | 1,067 | 835
Dividends paid | $ 17,500 |  |  | $ 16,000 |  | 17,500 | $ 55,400
Issuance of Common Shares from an at-the-market program, net of issuance costs (in shares) |  |  |  | 1 |  |  | 1
Issuance of Common Shares from an at-the-market program, net of issuance costs |  |  |  | $ 10,000 | $ 10,000 |  | $ 10,000
ASUS |  |  |  |  |  |  |
Capital stock |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  | $ 16,000 |
Restricted Stock |  |  |  |  |  |  |
Capital stock |  |  |  |  |  |  |
Restricted stock units outstanding (in shares) | 135,575 |  |  | 106,879 |  | 135,575 | 106,879

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