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Debt (Maturities on Long-Term Debt for Each of The Next Five Years) (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Maturities    
2019   $ 34,150
2020   34,150
2021   34,150
2022   247,723
2023   1,684,430
Senior notes | Senior notes maturing due 2022    
Maturities    
Long-term debt, maturity repayment deadline 91 days  
Revolving Credit Facility    
Maturities    
Extinguishment of debt   $ 22,800