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Share-based Compensation
 6 Months Ended
Jun. 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 
 June 30,
 
Six Months Ended 
 June 30,
 
2014
 
2013
 
2014
 
2013
 
(in thousands)
Share-based compensation expense (income)
 
 
 
 
 
 
 
Cost of revenues: Manufacturing
$
(93
)
 
$
(538
)
 
$
763

 
$
494

Cost of revenues: Railcar Services
(40
)
 
(253
)
 
238

 
32

Selling, general and administrative
99

 
(2,142
)
 
2,971

 
2,549

Total share-based compensation expense (income)
$
(34
)
 
$
(2,933
)
 
$
3,972

 
$
3,075


As of June 30, 2014, unrecognized compensation costs related to the unvested portion of SARs were estimated to be $2.6 million and were expected to be recognized over a weighted average period of 28 months.