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Leases - Operating lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases        
Operating lease costs $ 1,693 $ 2,198 $ 3,575 $ 4,392
Variable lease costs 2 34 12 43
Total lease costs $ 1,695 $ 2,232 $ 3,587 $ 4,435