Deferred tax reconciliation (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Change in net deferred income tax liability from the preceding table	$ 75,864
Deferred taxes associated with other comprehensive loss	(2,355)
Excess deferred income tax amortization	(10,295)
Other	(2,964)
Deferred income taxes	$ 60,250	$ (1,801)	$ 63,415