Operating expenses (Schedule of Depreciation and Amortization Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating expenses
Depreciation expense	$ 7,825	$ 8,127	$ 23,461	$ 24,309
Amortization expense	16,465	13,780	49,352	40,603
Total depreciation and amortization expenses	$ 24,290	$ 21,907	$ 72,813	$ 64,912