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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. 11, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Dividends Payable [Line Items]
Dividend per share	$ 0.25
Record date	Feb. 11, 2022
Payment date		Mar. 04, 2022
Fourth Quarter 2019 [Member]
Dividends Payable [Line Items]
Declaration date		Jan. 22, 2021
Dividend per share		$ 0.2200
Record date		Feb. 12, 2021
Total dividends		$ 24,181
Payment date		Mar. 05, 2021
First Quarter 2020 [Member]
Dividends Payable [Line Items]
Declaration date		May 07, 2021
Dividend per share		$ 0.2200
Record date		May 26, 2021
Total dividends		$ 24,279
Payment date		Jun. 16, 2021
Second Quarter 2020 [Member]
Dividends Payable [Line Items]
Declaration date		Aug. 04, 2021
Dividend per share		$ 0.2500
Record date		Aug. 25, 2021
Total dividends		$ 27,607
Payment date		Sep. 15, 2021
Third Quarter 2020 [Member]
Dividends Payable [Line Items]
Declaration date		Nov. 03, 2021
Dividend per share		$ 0.2500
Record date		Nov. 24, 2021
Total dividends		$ 27,652
Payment date		Dec. 15, 2021
Fourth Quarter 2018 [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 2019 [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 2019 [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 2019 [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 2017 [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 2018 [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 2018 [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 2018 [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

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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