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Note 11 - Business Segments - Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Assets $ 3,778,382 $ 3,828,988
Operating Segments [Member] | JBI [Member]    
Assets 2,026,000 2,032,000
Operating Segments [Member] | DCS [Member]    
Assets 942,000 951,000
Operating Segments [Member] | ICS [Member]    
Assets 130,000 136,000
Operating Segments [Member] | JBT [Member]    
Assets 270,000 279,000
Operating Segments [Member] | Corporate and Other [Member]    
Assets $ 410,000 $ 431,000