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Note 3 - Property and Equipment, Net - Depreciation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Depreciation expense $ 60,852 $ 51,357 $ 120,897 $ 101,503