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Share-based Compensation
9 Months Ended
Sep. 30, 2014
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, or 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,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Share-based compensation expense
 
 
 
 
 
 
 
Cost of revenues: Manufacturing
$
239

 
$
195

 
$
1,002

 
$
689

Cost of revenues: Railcar Services
13

 
70

 
251

 
102

Selling, general and administrative
288

 
900

 
3,259

 
3,449

Total share-based compensation expense
$
540

 
$
1,165

 
$
4,512

 
$
4,240


As of September 30, 2014, unrecognized compensation costs related to the unvested portion of SARs were estimated to be $1.9 million and were expected to be recognized over a weighted average period of 26 months.