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Goodwill and Intangibles, net - Changes in the Carrying Amount of Goodwill (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Goodwill [Roll Forward]  
Beginning balance $ 131,741
Measurement period adjustment 725
Disposition (5,415)
Ending balance 127,051
Construction  
Goodwill [Roll Forward]  
Beginning balance 38,607
Measurement period adjustment 0
Disposition 0
Ending balance 38,607
Marine Services  
Goodwill [Roll Forward]  
Beginning balance 14,251
Measurement period adjustment 0
Disposition 0
Ending balance 14,251
Energy  
Goodwill [Roll Forward]  
Beginning balance 2,122
Measurement period adjustment 0
Disposition 0
Ending balance 2,122
Telecom  
Goodwill [Roll Forward]  
Beginning balance 3,378
Measurement period adjustment 0
Disposition 0
Ending balance 3,378
Insurance  
Goodwill [Roll Forward]  
Beginning balance 47,290
Measurement period adjustment 0
Disposition 0
Ending balance 47,290
Life Sciences  
Goodwill [Roll Forward]  
Beginning balance 3,620
Measurement period adjustment 0
Disposition (3,620)
Ending balance 0
Broadcasting  
Goodwill [Roll Forward]  
Beginning balance 20,678
Measurement period adjustment 725
Disposition 0
Ending balance 21,403
Other  
Goodwill [Roll Forward]  
Beginning balance 1,795
Measurement period adjustment 0
Disposition (1,795)
Ending balance $ 0