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Equity and dividends (Schedule of Quarterly Dividends Declared and Paid) (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 12, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Dividends Payable [Line Items] |  |  |  |
Dividend per share | $ 0.22 |  |  |
Record date |  | Feb. 12, 2021 |  |
Payment date |  | Mar. 05, 2021 |  |
Fourth Quarter 2019 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  | Jan. 24, 2020 |  |
Dividend per share |  | $ 0.2000 |  |
Record date |  | Feb. 14, 2020 |  |
Total dividends |  | $ 21,905 |  |
Payment date |  | Mar. 06, 2020 |  |
First Quarter 2020 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  | May 06, 2020 |  |
Dividend per share |  | $ 0.2000 |  |
Record date |  | May 27, 2020 |  |
Total dividends |  | $ 21,681 |  |
Payment date |  | Jun. 17, 2020 |  |
Second Quarter 2020 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  | Aug. 05, 2020 |  |
Dividend per share |  | $ 0.2200 |  |
Record date |  | Aug. 26, 2020 |  |
Total dividends |  | $ 24,053 |  |
Payment date |  | Sep. 16, 2020 |  |
Third Quarter 2020 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  | Nov. 04, 2020 |  |
Dividend per share |  | $ 0.2200 |  |
Record date |  | Nov. 25, 2020 |  |
Total dividends |  | $ 24,098 |  |
Payment date |  | Dec. 16, 2020 |  |
Fourth Quarter 2018 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  |  | Jan. 25, 2019 |
Dividend per share |  |  | $ 0.1800 |
Record date |  |  | Feb. 15, 2019 |
Total dividends |  |  | $ 19,568 |
Payment date |  |  | Mar. 08, 2019 |
First Quarter 2019 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  |  | May 08, 2019 |
Dividend per share |  |  | $ 0.1800 |
Record date |  |  | May 29, 2019 |
Total dividends |  |  | $ 19,592 |
Payment date |  |  | Jun. 19, 2019 |
Second Quarter 2019 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  |  | Aug. 08, 2019 |
Dividend per share |  |  | $ 0.2000 |
Record date |  |  | Aug. 28, 2019 |
Total dividends |  |  | $ 21,631 |
Payment date |  |  | Sep. 18, 2019 |
Third Quarter 2019 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  |  | Nov. 07, 2019 |
Dividend per share |  |  | $ 0.2000 |
Record date |  |  | Nov. 27, 2019 |
Total dividends |  |  | $ 21,744 |
Payment date |  |  | Dec. 18, 2019 |
Fourth Quarter 2017 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  |  |  | Jan. 26, 2018
Dividend per share |  |  |  | $ 0.1700
Record date |  |  |  | Feb. 16, 2018
Total dividends |  |  |  | $ 18,246
Payment date |  |  |  | Mar. 09, 2018
First Quarter 2018 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  |  |  | May 09, 2018
Dividend per share |  |  |  | $ 0.1700
Record date |  |  |  | May 30, 2018
Total dividends |  |  |  | $ 18,342
Payment date |  |  |  | Jun. 20, 2018
Second Quarter 2018 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  |  |  | Aug. 07, 2018
Dividend per share |  |  |  | $ 0.1800
Record date |  |  |  | Aug. 29, 2018
Total dividends |  |  |  | $ 19,528
Payment date |  |  |  | Sep. 19, 2018
Third Quarter 2018 [Member] |  |  |  |
Dividends Payable [Line Items] |  |  |  |
Declaration date |  |  |  | Nov. 08, 2018
Dividend per share |  |  |  | $ 0.1800
Record date |  |  |  | Nov. 28, 2018
Total dividends |  |  |  | $ 19,562
Payment date |  |  |  | Dec. 19, 2018

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