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Share-based Compensation
3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation
Share-based Compensation
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 
 March 31,
 
2017
 
2016
 
(in thousands)
Share-based compensation income
 
 
 
Cost of revenues: Manufacturing
$
(18
)
 
$
(117
)
Cost of revenues: Railcar services
(2
)
 
(15
)
Selling, general and administrative
(227
)
 
(179
)
Total share-based compensation income
$
(247
)
 
$
(311
)

As of March 31, 2017, unrecognized compensation costs related to the unvested portion of SARs were estimated to be $2.2 million and were expected to be recognized over a weighted average period of 32 months.