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Common stock (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Dividends declared per common share | $ 0.8750 | $ 0.8550 | $ 0.8350
Dividends declared to common stockholders | $ 178,761 | $ 174,084 | $ 168,489
Credit agreement limitation on company's subsidiaries ratio of funded debt to capitalization | 60.00% |  |
Company's subsidiaries net assets restricted from use for dividend payments | $ 1,900,000 |  |
Common stock |  |  |
Dividends declared to common stockholders | $ 177,900 | $ 173,000 | $ 167,400
Centennial [Member] |  |  |
Maximum distributions to the company as a ratio of average consolidated indebtedness to consolidated EBITDA | 350.00% |  |

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