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Leases (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lessee, Lease, Description [Line Items]        
Operating lease renewal term 5 years   5 years  
Sublease income $ 500 $ 1,000 $ 900 $ 1,800
Estimated aggregate sublease income to be received in the future $ 5,800   5,800  
Lease asset impairments     $ 7,829 $ 2,141
Minimum        
Lessee, Lease, Description [Line Items]        
Operating lease terms 3 years   3 years  
Maximum        
Lessee, Lease, Description [Line Items]        
Operating lease terms 5 years   5 years