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Long term Debt (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Financing Arrangements and Long-Term Debt [Abstract]  
Future maturities of long term debt in 2018 $ 9.9
Future maturities of long term debt in 2019 10.4
Future maturities of long term debt in 2020 11.0
Future maturities of long term debt in 2021 11.5
Future maturities of long term debt in 2022 1,110.0
Thereafter $ 1,770.0
Capital lease duration 25 years