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Commitments and Contingencies (Tables)
6 Months Ended
Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Components of Lease Expense
The components of lease expense were as follows:
Three months ended
June 30,
Six months ended
June 30,
(dollars in thousands)
2021
2020
2021
2020
Operating lease cost(1)
$2,372 $6,281 $5,213 $12,592 
Variable lease cost699 1,113 1,398 2,371 
Sublease income(366)(940)(826)(1,853)
Net lease cost$2,705 $6,454 $5,785 $13,110 
(1)Includes short-term lease costs, which were immaterial.