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Equity and dividends (Narrative) (Details) - USD ($) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 11, 2022 | Sep. 13, 2021 | Feb. 12, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Dividends Payable [Line Items] |  |  |  |  |  |
Preferred shares issued |  |  |  | 0 |  |
Stock repurchased during period, shares |  |  |  | 0 | 1,525,312 | 1,223,674
Stock repurchased during period, value |  |  |  |  | $ 53,170,000 | $ 42,012,000
Acquisition of remaining interest in NCI |  |  |  | $ 5,556,000 |  |
Dividends declared (USD per share) | $ 0.25 |  |  |  |  |
Dividends payable date |  |  |  | Mar. 04, 2022 |  |
Dividends, date of record | Feb. 11, 2022 |  |  |  |  |
Dividends, common stock |  |  | $ 27,658,000 |  |  |
Gain (Loss) from intra-entity foreign currency transactions |  |  |  | $ 8,763,000 | 10,826,000 | $ 1,082,000
Shares issued for business combination [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Share capital from additional paid-in capital |  |  |  | 4,764,000 |  |
Unrecognized share based continuing employment costs |  |  |  | $ 10,733,000 | $ 19,933,000 |
Unrecognized share based continuing employment costs, weighted average period for recognition |  |  |  | 1 year 7 months 6 days |  |
Shares forfeited |  |  |  | 55,510 |  |
Xcira LLC [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Percentage of membership interest acquired |  | 25.00% |  |  |  |
Acquisition of remaining interest in NCI |  | $ 5,555,555 |  |  |  |
Percentage of ownership interest |  | 100.00% |  |  |  |
Rouse Services LLC [Member] | Shares issued for business combination [Member] |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Shares forfeited |  |  |  | 55,510 |  |

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