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Share-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of share-based compensation expense
The following table presents the amounts incurred by ARI for share-based compensation, related to stock appreciation rights (SARs), and the corresponding line items on the condensed consolidated statements of operations that they are classified within: 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Share-based compensation expense (income)
 
 
 
 
 
 
 
Cost of revenues: Manufacturing
$
23

 
$
28

 
$
(12
)
 
$
(145
)
Cost of revenues: Railcar services
—

 
5

 
(3
)
 
(12
)
Selling, general and administrative
223

 
362

 
(211
)
 
265

Total share-based compensation expense (income)
$
246

 
$
395

 
$
(226
)
 
$
108