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Equity and dividends (Schedule of Quarterly Dividends Declared and Paid) (Details) - USD ($) $ / shares in Units, $ in Thousands | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Fourth quarter 2021 |  |
Dividends Payable [Line Items] |  |
Dividend per share | $ 0.2500 |
Total dividends | $ 27,659 |
Fourth quarter 2020 |  |
Dividends Payable [Line Items] |  |
Dividend per share |  | $ 0.2200
Total dividends |  | $ 24,181
First quarter 2022 |  |
Dividends Payable [Line Items] |  |
Dividend per share | $ 0.2500 |
Total dividends | $ 27,693 |
First Quarter 2021 |  |
Dividends Payable [Line Items] |  |
Dividend per share |  | $ 0.2200
Total dividends |  | $ 24,279
Second quarter 2022 |  |
Dividends Payable [Line Items] |  |
Dividend per share | $ 0.2700 |
Total dividends | $ 29,932 |
Second quarter 2021 |  |
Dividends Payable [Line Items] |  |
Dividend per share |  | $ 0.2500
Total dividends |  | $ 27,607

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