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Commitments And Contingencies (Minimum Future Lease Payments) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Lessee, Lease, Description [Line Items]  
2019 $ 42,455
2020 36,299
2021 29,714
2022 20,721
2023 15,334
Thereafter 54,149
Total minimum lease payments (1) 198,672
Dayton, Ohio  
Lessee, Lease, Description [Line Items]  
Total minimum lease payments (1) $ 25,400