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Derivatives (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 01, 2022
Mar. 01, 2019
Derivatives, Fair Value [Line Items]        
Net broker receivables $ 1.0 $ 5.6    
Margin deposit assets 1.3 5.1    
Increase (decrease) in variation margin deposits outstanding (0.3) $ 0.5    
Fair value of embedded derivative liability $ 45.2      
Convertible Preferred Stock [Member] | Scenario, Forecast [Member]        
Derivatives, Fair Value [Line Items]        
Basis spread       2.00
Reset rate     10.75%  
Percentage below issue price     110.00%  
Convertible Preferred Stock [Member] | London Interbank Offered Rate (LIBOR) [Member] | Scenario, Forecast [Member]        
Derivatives, Fair Value [Line Items]        
Basis spread     0.0750