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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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