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Leases (Supplemental Information Relating to Operating Leases) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Lease expense incurred: Operating lease cost $ 32,508 $ 24,524  
Operating lease right of use assets $ 149,125 $ 161,435 $ 69,869
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets Other assets Other assets
Operating lease liabilities $ 165,292 $ 169,909 $ 77,270
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other liabilities Other liabilities Other liabilities
Operating cash flows from operating leases $ (20,594) $ (20,041)  
Weighted average remaining operating lease term 12 years 3 months 18 days 12 years 7 months 6 days  
Weighted average discount rate on operating leases 4.10% 3.91%