Income taxes (Tables)

6 Months Ended

Jun. 30, 2020

Income Tax Disclosure [Abstract]

Provision for income taxes

Provision for income taxes is based on the following:

	For Three Months Ended						For Six Months Ended
	June 30,						June 30,
	2020			2019			2020			2019
Taxes calculated using the estimated annual effective tax rate	$	164		$	238		$	330		$	458
Discrete tax items	(265)			(29)			(381)			(89)
Provision for income taxes	$	(101)		$	209		$	(51)		$	369
Actual effective tax rate	(8)		%	14		%	(2)		%	13		%