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Reportable Segments - Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets    
Assets $ 2,452,900 $ 2,481,400
Discontinued Operations    
Assets    
Assets 69,400 68,600
Operating Segments | D&S East    
Assets    
Assets 531,900 528,600
Operating Segments | D&S West    
Assets    
Assets 377,700 349,000
Operating Segments | E&C Cryogenics    
Assets    
Assets 424,400 430,300
Operating Segments | E&C FinFans    
Assets    
Assets 983,400 1,028,000
Corporate    
Assets    
Assets $ 66,100 $ 76,900