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Income taxes - Current and Deferred Amounts of Provision for Income Taxes Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income taxes
Current									$ 6,600	$ 2,761	$ 4,072
Deferred									(1,779)	394	(681)
Total income tax expense (benefit)	$ 1,308	$ 1,523	$ 1,311	$ 679	$ 446	$ 991	$ 957	$ 761	$ 4,821	$ 3,155	$ 3,391

X

- Definition

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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