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Earnings per share attributable to stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net income attributable to:
Basic	$ 32,336	$ 45,387	$ 121,273	$ 121,239
Diluted	$ 32,336	$ 45,387	$ 121,273	$ 121,239
Weighted average number of shares outstanding:
Basic	110,410,172	109,018,469	110,233,851	108,887,026
Diluted	111,391,396	110,369,718	111,333,247	110,060,712
Per Share Amount
Basic	$ 0.29	$ 0.42	$ 1.10	$ 1.11
Diluted	$ 0.29	$ 0.41	$ 1.09	$ 1.10
Share Units [Member]
Weighted average number of shares outstanding:
Effect of dilutive securities:	324,218	548,859	408,574	519,915
Stock Options [Member]
Weighted average number of shares outstanding:
Effect of dilutive securities:	657,006	802,390	690,822	653,771
Per Share Amount
Effect of dilutive securities:		(0.01)	(0.01)	(0.01)

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all adjustments to dilutive potential common shares or units outstanding during the reporting period.

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