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Leases (Details 1) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating lease expense $ 14,146 $ 21,045 $ 28,004 $ 54,233
Short-term and variable lease expense 26,921 12,281 49,471 20,961
Total lease expense $ 41,067 $ 33,326 $ 77,475 $ 75,194