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Leases (Supplemental Information Relating to Operating Leases) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
Lease expense incurred: Operating lease cost $ 24,524  
Operating lease right of use assets 161,435 $ 69,869
Operating lease liabilities 169,909 $ 77,270
Operating cash flows from operating leases $ 20,041  
Weighted average remaining operating lease term 12 years 7 months 6 days  
Weighted average discount rate on operating leases 3.91%