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Leases, Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease Cost [Abstract]        
Operating lease cost $ 10,680 $ 11,873 $ 21,072 $ 20,914
Variable lease cost 206 444 915 596
Short-term lease cost 4,015 5,076 7,068 13,353
Sublease income (306) (130) (580) (374)
Total lease cost $ 14,595 $ 17,263 $ 28,475 $ 34,489