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Income Taxes (Details)
€ in Millions, AUD in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
EUR (€)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
AUD
Mar. 31, 2016
USD ($)
Effective income tax rate 44.60% 32.20%        
Tax benefit from Short Line Tax Credit   $ 6,300,000        
Tax credits percentage of qualified maintenance expenditures to reduce federal income tax 50.00%          
Tax credit limitation per mile on maintenance expenditures to reduce federal income tax $ 3,500          
Impairment of Assets [Member] | Arrium Limited [Member] | Australian Operations [Member]            
Valuation allowance         AUD 2.6 $ 2,000,000
ERS Railways [Member] | U.K./European Operations [Member]            
Valuation allowance     € 1.6 $ 1,700,000