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Leases (Narrative) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Lessee, Lease, Description [Line Items]      
Right-of-use assets $ 13,604   $ 19,544
Present value of lease liabilities 14,036    
Other commitment 69,997    
Operating lease, rent expense $ 11,200 $ 28,000  
Minimum | Computer Equipment      
Lessee, Lease, Description [Line Items]      
Lease term 3 years    
Maximum | Computer Equipment      
Lessee, Lease, Description [Line Items]      
Lease term 5 years