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Leases (Details 1) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease expense $ 14,694 $ 35,068 $ 68,927 $ 98,641
Short-term and variable lease expense 26,429 12,653 47,390 31,541
Total lease expense $ 41,123 $ 47,721 $ 116,317 $ 130,182