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Investment in Visa SunCoke (Details Textual)
T in Thousands
12 Months Ended
Mar. 18, 2013
USD ($)
T
Dec. 31, 2015
USD ($)
T
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Schedule of Equity Method Investments [Line Items]        
Ownership percentage (as a percent)   100.00%    
Impairment charge   $ 0 $ 150,300,000 $ 0
Equity method investment in VISA SunCoke Limited   0 22,300,000  
Loss from equity method investment   $ 21,600,000 35,000,000 $ 2,200,000
VISA SunCoke Limited        
Schedule of Equity Method Investments [Line Items]        
Cokemaking facility capacity (in tons) | T 440 440    
Investment in joint venture $ 67,700,000      
Ownership percentage (as a percent) 49.00% 49.00%    
Impairment charge   $ 19,400,000 30,500,000  
Equity method investment in VISA SunCoke Limited   $ 0    
Accumulated other comprehensive loss     $ 9,000,000  
VISA SunCoke Limited | VISA Steel        
Schedule of Equity Method Investments [Line Items]        
Ownership percentage (as a percent) 51.00%