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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, current $ 33.6 $ 32.8
Senior Notes [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt, long-term and short-term, combined carrying value 123.2 126.3
Long-term debt, current 6.1 6.1
Long-term debt, fair value 60.8 57.9
Long-term debt, face amount 74.3 74.3
Payment in Kind (PIK) Note [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term debt, current 27.5 26.7
Long-term debt, fair value $ 21.7 $ 21.8