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Operating Leases (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee Lease Description [Line Items]    
Operating lease right-of-use assets $ 793,200 $ 725,800
Operating lease liabilities $ 839,806 $ 766,000
Minimum [Member] | Office Space and Office Equipment [Member]    
Lessee Lease Description [Line Items]    
Operating leases remaining lease term 1 year  
Maximum [Member] | Office Space and Office Equipment [Member]    
Lessee Lease Description [Line Items]    
Operating leases remaining lease term 15 years