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Operating expenses (Schedule of Depreciation and Amortization Expenses) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Operating expenses        
Depreciation expense $ 8,345 $ 7,536 $ 16,182 $ 15,573
Amortization expense 13,590 10,321 26,823 21,577
Total depreciation and amortization expenses $ 21,935 $ 17,857 $ 43,005 $ 37,150