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Commitments and Contingencies (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
Commitments and Contingencies Disclosure [Abstract]        
Operating lease cost [1] $ 2,372 $ 6,281 $ 5,213 $ 12,592
Variable lease cost 699 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.