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Revolving Credit Facility (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]    
Line of Credit Facility, Remaining Borrowing Capacity $ 44,548 $ 44,280
Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Expiration Date Jul. 26, 2019  
Line of Credit Facility, Maximum Borrowing Capacity $ 50,000  
Outstanding borrowings $ 0 0
Line of Credit Facility, Interest Rate Description rate of LIBOR plus an applicable margin of between 1.25% and 1.75% depending on the Company's consolidated leverage ratio or at a base rate, as selected by the Company. Base rate loans will bear interest at the highest of (a) the federal funds rate plus 0.50%, (b) the prime rate or (c) LIBOR plus 1.00%  
Line of Credit Facility, Collateral Borrowings under the Revolving Credit Facility are secured by a first priority perfected security interest in substantially all of the Borrowers' assets excluding railcars held by the Company's railcar leasing subsidiary, JAIX. The Borrowers also have pledged all of the equity interests in the Company's direct and indirect domestic subsidiaries as security for the Revolving Credit Facility.  
Revolving Credit Facility [Member] | Letter of Credit Sub-Facility [Member]    
Line of Credit Facility [Line Items]    
Outstanding borrowings $ 5,452 $ 5,720
Revolving Credit Facility [Member] | Base Rate Loans [Member] | Federal Funds Rate [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 0.50%  
Revolving Credit Facility [Member] | Base Rate Loans [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.00%  
Letter of Credit [Member] | Letter of Credit Sub-Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 30,000  
Minimum [Member] | Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.10%  
Minimum [Member] | Revolving Credit Facility [Member] | Revolving Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.25%  
Maximum [Member] | Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Maximum net leverage ratio 2.50  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%  
Maximum [Member] | Revolving Credit Facility [Member] | Revolving Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]    
Line of Credit Facility [Line Items]    
Debt Instrument, Basis Spread on Variable Rate 1.75%