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
Mar. 31, 2021
Mar. 31, 2020
Components of lease expense:    
Operating lease cost $ 11,810 $ 12,271
Short-term lease cost 3,354 3,064
Sublease income (206) (62)
Net lease cost 14,958 15,273
Variable lease cost $ 1,697 $ 1,444