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Fair Value of Financial Instruments Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Heart of Georgia Railroad [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   $ (537) $ (298) $ 0
Freightliner [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Percentage of economic interest retained by acquiree's management 6.00%      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings   0 (2,405) $ (2,278)
Fair Value, Inputs, Level 2 [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Assets, Fair Value Disclosure   45,695 22,319  
Financial Liabilities Fair Value Disclosure   14,454 15,211  
Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Forward Contracts [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative Asset   26,011 13,657  
Derivative Liability   59 829  
Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative Liability   14,395 14,382  
Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] | Currency Swap [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Derivative Asset   19,684 8,662  
Fair Value, Inputs, Level 3 [Member] | Heart of Georgia Railroad [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Business Combination, Contingent Consideration, Liability   $ 6,511 $ 5,974