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Leases (Supplemental Information Relating to Operating Leases) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
Lease expense incurred: Operating lease cost $ 5,187  
Operating lease right of use assets 66,430 $ 69,869
Operating lease liabilities 73,529 $ 77,270
Operating cash flows from operating leases $ 4,431  
Weighted average remaining operating lease term 5 years 6 months  
Weighted average discount rate on operating leases 4.48%