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Debt, Long-term Debt Maturities (Details)
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
Maturities of long term debt in one year $ 4,000,000
Maturities of long term debt in two years 4,000,000
Maturities of long term debt in three years 4,000,000
Maturities of long term debt in four years 4,000,000
Maturities of long term debt in five years 375.0
Maturities of long term debt thereafter $ 600.0