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Equity and dividends (Narrative) (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 13, 2021 | Dec. 08, 2020 | Oct. 31, 2021 | Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Preferred shares issued |  |  |  | 0 |  |  | 0 |
Stock repurchased during period, shares |  |  |  | 0 |  | 0 | 0 | 1,525,312
Stock repurchased during period, value |  |  |  |  |  |  |  | $ 53,170,000
Acquisition of remaining interest in NCI |  |  |  |  |  |  | $ 5,556,000 |
Gain (Loss) from intra-entity foreign currency transactions |  |  |  | $ (3,331,000) |  | $ 5,634,000 | (5,890,000) | 3,300,000
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% |  |  |  |  |  |  |
Subsequent Events [Member] |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Dividends declared (USD per share) |  |  | $ 0.25 |  |  |  |  |
Dividends payable date |  |  | Dec. 15, 2021 |  |  |  |  |
Dividends, date of record |  |  | Nov. 24, 2021 |  |  |  |  |
Rouse Services LLC [Member] |  |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |  |
Common shares issued (in shares) |  | 312,193 |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |  |
Fair value of common shares (per share) |  | $ 71.09 |  |  |  |  |  |
Unrecognized share based continuing employment costs |  |  |  | $ 9,191,000 |  | $ 0 | $ 9,191,000 | $ 0
Unrecognized share based continuing employment costs, weighted average period for recognition |  |  |  |  |  |  | 1 year 6 months |
Number of common shares restrictions have not yet vested |  |  |  |  |  |  | 256,683 |
Shares forfeited |  |  |  |  | 55,510 |  | 55,510 |

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