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Income Taxes (Details)
€ in Millions, AUD in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2016
AUD
Jun. 30, 2016
USD ($)
Effective income tax rate 38.10% 38.10% 31.40% 40.60% 40.60% 31.60%    
Tax benefit from Short Line Tax Credit     $ 7,200,000     $ 13,500,000    
Tax credits percentage of qualified maintenance expenditures to reduce federal income tax       50.00% 50.00%      
Tax credit limitation per mile on maintenance expenditures to reduce federal income tax         $ 3,500      
U.K./European Operations [Member]                
Valuation allowance increase/decrease € (0.6) $ (600,000)   € 1.0 $ 1,000,000      
Impairment of Assets [Member] | Australian Operations [Member]                
Valuation allowance             AUD 2.6 $ 2,000,000