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Long-Term Debt - Equipment Loans (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
Cost of funds rate 10.00%
Equipment Loans [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Face Amount $ 31.1
Stated percentage 0.00%
Long-term Debt, Maturities, Weighted Average of Monthly Repayments $ 1.0
Equipment Loans [Member] | Minimum  
Debt Instrument [Line Items]  
Debt instrument, term (in months) 6 months
Stated percentage 0.00%
Equipment Loans [Member] | Maximum  
Debt Instrument [Line Items]  
Debt instrument, term (in months) 36 months
Stated percentage 800.00%