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Note 2 - Property and Equipment, Net - Depreciation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Depreciation expense $ 64,478 $ 57,278 $ 190,975 $ 178,175