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Leases - Net Lease Cost (Details) - 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 cost $ 3,891 $ 3,879 $ 7,720 $ 7,824
Short term lease cost 0 0 0 0
Variable lease cost 747 772 1,501 3,397
Sublease income (99) (214) (252) (426)
Net lease cost $ 4,539 $ 4,437 $ 8,969 $ 10,795