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Leases (Narrative) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Jan. 01, 2019
Lessee, Lease, Description [Line Items]      
Operating lease liabilities $ 60,917 $ 61,118  
Operating lease right-of-use assets $ 81,260 $ 82,596  
ASU 2016-02      
Lessee, Lease, Description [Line Items]      
Operating lease liabilities     $ 60,600
Operating lease right-of-use assets     82,500
Derecognized intangible assets     $ 22,300
Minimum      
Lessee, Lease, Description [Line Items]      
Lease renewal term 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Lease renewal term 50 years