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Equity and dividends (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity and dividends |
Schedule of Quarterly Dividends Declared and Paid | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Dividend |  | ​ |  | Total |  | ​
​ | ​ | Declaration date | ​ | per share | ​ | Record date | ​ | dividends | ​ | Payment date
Year ended December 31, 2020: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Fourth quarter 2019 | ​ | January 24, 2020 | ​ | $ | 0.2000 | ​ | February 14, 2020 | ​ | $ | 21,905 | ​ | March 6, 2020
First quarter 2020 | ​ | May 6, 2020 | ​ |  | 0.2000 | ​ | May 27, 2020 | ​ |  | 21,681 | ​ | June 17, 2020
Second quarter 2020 | ​ | August 5, 2020 | ​ |  | 0.2200 | ​ | August 26, 2020 | ​ |  | 24,053 | ​ | September 16, 2020
Third quarter 2020 | ​ | November 4, 2020 | ​ |  | 0.2200 | ​ | November 25, 2020 | ​ |  | 24,098 | ​ | December 16, 2020
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2019: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​ |
Fourth quarter 2018 | ​ | January 25, 2019 | ​ | $ | 0.1800 | ​ | February 15, 2019 | ​ | $ | 19,568 | ​ | March 8, 2019
First quarter of 2019 | ​ | May 8, 2019 | ​ |  | 0.1800 | ​ | May 29, 2019 | ​ |  | 19,592 | ​ | June 19, 2019
Second quarter of 2019 | ​ | August 8, 2019 | ​ |  | 0.2000 | ​ | August 28, 2019 | ​ |  | 21,631 | ​ | September 18, 2019
Third quarter 2019 | ​ | November 7, 2019 | ​ |  | 0.2000 | ​ | November 27, 2019 | ​ |  | 21,744 | ​ | December 18, 2019
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Year ended December 31, 2018: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​ |
Fourth quarter 2017 | ​ | January 26, 2018 | ​ | $ | 0.1700 | ​ | February 16, 2018 | ​ | $ | 18,246 | ​ | March 9, 2018
First quarter of 2018 | ​ | May 9, 2018 | ​ |  | 0.1700 | ​ | May 30, 2018 | ​ |  | 18,342 | ​ | June 20, 2018
Second quarter of 2018 | ​ | August 7, 2018 | ​ |  | 0.1800 | ​ | August 29, 2018 | ​ |  | 19,528 | ​ | September 19, 2018
Third quarter 2018 | ​ | November 8, 2018 | ​ |  | 0.1800 | ​ | November 28, 2018 | ​ |  | 19,562 | ​ | December 19, 2018

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- Definition Tabular disclosure of information related to dividends declared, including paid and unpaid dividends. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration