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Debt (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Long-term debt, current $ 33.6 $ 32.8
Payment in Kind (PIK) Note [Member]    
Debt instrument interest rate 8.00%  
Long-term debt, carrying amount $ 0.0 0.0
Long-term debt, current $ 27.5 26.7
Senior Notes [Member]    
Debt instrument interest rate 8.25%  
Long-term debt, face amount $ 74.3 74.3
Long-term debt, current $ 6.1 $ 6.1