Quarterly report pursuant to Section 13 or 15(d)

Leases - Components of lease expense (Details)

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Leases - Components of lease expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Components of lease expense:        
Operating lease cost $ 12,636 $ 12,096 $ 24,446 $ 24,367
Short-term lease cost 3,844 2,813 7,198 5,877
Sublease income (215) (49) (421) (111)
Net lease cost 16,265 14,860 31,223 30,133
Variable lease cost $ 1,808 $ 1,330 $ 3,505 $ 2,774