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Leases, Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Lease Cost [Abstract]        
Operating lease cost $ 11,553 $ 9,490 $ 32,467 $ 29,461
Variable lease cost 485 386 1,081 1,417
Short-term lease cost 4,645 7,727 17,998 24,582
Sublease income (418) (366) (792) (924)
Total lease cost $ 16,265 $ 17,237 $ 50,754 $ 54,536