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Debt (Maturities On Long-Term Debt For Each Of The Next Five Years) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Maturities      
2019     $ 34,150
2020     34,150
2021     34,150
2022     226,713
2023     $ 1,684,430
Senior notes | Senior notes maturing due 2022      
Maturities      
Long-term debt, maturity repayment deadline   91 days  
Subsequent event | Senior notes | Senior notes maturing due 2022      
Maturities      
Extinguishment of debt $ 1,800