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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Feb. 18, 2019
Jun. 30, 2018
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2018    
Document Period End Date Dec. 31, 2018    
Current Fiscal Year End Date --12-31    
Entity Central Index Key 0001320854    
Entity Registrant Name FREIGHTCAR AMERICA, INC.    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   12,601,889  
Entity Current Reporting Status Yes    
Entity Public Float     $ 205.0
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No