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Earnings per Share/Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Capital stock |  |  |  |  |  |
Options outstanding (in shares) | 0 |  | 0 |  | 0 | 0
Other financing activities |  |  |  |  | $ (1,138) | $ (899)
Dividends paid |  |  |  |  | $ 31,929 | $ 29,394
Common Stock, Dividends, Per Share, Cash Paid | $ 0.4300 |  | $ 0.3975 |  | $ 0.8600 | $ 0.7950
Issuance of Common Shares from an at-the-market program, net of issuance costs | $ 16,724 | $ 15,584 |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 227,667 |  |  |  | 455,648 |
Payments for commissions | $ 300 |  |  |  | $ 500 |
Sale of stock, consideration received on transaction | 16,800 |  |  |  | $ 33,000 |
Issuances of Common Shares under stock-based compensation plans (in shares) |  |  |  |  | 20,939 | 14,358
Parent Company |  |  |  |  |  |
Capital stock |  |  |  |  |  |
Dividends paid | $ 16,000 |  | $ 14,700 |  | $ 31,900 | $ 29,400
GSWC |  |  |  |  |  |
Capital stock |  |  |  |  |  |
Issuance of Common Shares from an at-the-market program, net of issuance costs (in shares) |  |  |  |  |  | 1
Other financing activities |  |  |  |  | (1,064) | $ (821)
Dividends paid |  |  | 14,700 |  | $ 0 | 39,400
Issuance of Common Shares from an at-the-market program, net of issuance costs |  |  |  | $ 10,000 |  | $ 10,000
ASUS |  |  |  |  |  |
Capital stock |  |  |  |  |  |
Dividends paid |  |  | $ 16,000 |  |  |
Restricted Stock |  |  |  |  |  |
Capital stock |  |  |  |  |  |
Restricted stock units outstanding (in shares) | 132,530 |  | 110,576 |  | 132,530 | 110,576

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