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Customer Concentrations (Details Textual)
T in Millions, $ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Customer
T
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Customer Concentrations (Textual) [Abstract]      
Number of customers with idle facilities | Customer 2    
Revenues $ 1,362.7 $ 1,503.8 $ 1,647.7
Coal Logistics | The Cline Group | Affiliated Entity      
Customer Concentrations (Textual) [Abstract]      
Revenues $ 22.0    
Coal Logistics | The Cline Group | Affiliated Entity | Sales Revenue, Segment      
Customer Concentrations (Textual) [Abstract]      
Sales to customers (as a percent) 27.10%    
Coal Logistics | The Cline Group | Affiliated Entity | Sales Revenue, Net      
Customer Concentrations (Textual) [Abstract]      
Sales to customers (as a percent) 1.60%    
Customer Concentration Risk      
Customer Concentrations (Textual) [Abstract]      
Quantity of coke sold to three primary customers (in tons) | T 4.1    
Number of primary customers in U.S | Customer 3    
Customer Concentration Risk | Accounts Receivable      
Customer Concentrations (Textual) [Abstract]      
Number of primary customers in U.S | Customer 3    
Customer Concentration Risk | ArcelorMittal | Accounts Receivable      
Customer Concentrations (Textual) [Abstract]      
Accounts receivable due $ 25.5    
Customer Concentration Risk | AK Steel | Accounts Receivable      
Customer Concentrations (Textual) [Abstract]      
Accounts receivable due 14.8    
Customer Concentration Risk | U.S Steel | Accounts Receivable      
Customer Concentrations (Textual) [Abstract]      
Accounts receivable due 5.9    
Customer Concentration Risk | ArcelorMittal Brazil | Accounts Receivable      
Customer Concentrations (Textual) [Abstract]      
Preferred dividend $ 9.5 $ 9.5 $ 9.5