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Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Weighted average common shares outstanding during the period - shares used for basic earnings per common share	9,341	9,803
Common shares issuable under share based payment plans which are potentially dilutive	35	30
Common shares used for diluted earnings per common share	9,376	9,833
Net income attributable to the Company	$ 28,373	$ 1,618
Basic earnings per common share:
Earnings per common share basic	$ 3.04	$ 0.17
Earnings per common share diluted	$ 3.03	$ 0.16

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