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Acquisitions, Dispositions, and Deconsolidations - Other Segments (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Feb. 28, 2020
Oct. 30, 2019
Jan. 31, 2020
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2020
Jan. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                  
Disposition of subsidiary       $ 22,800 $ 0        
Proceeds from divestiture of businesses       144,000 0        
Loss on sale of subsidiary       (39,300) 0        
Huawei Marine Networks [Member]                  
Business Acquisition [Line Items]                  
Consideration to be received   $ 285,000              
Equity Method Investments       $ 1,500 $ 4,800     $ 5,000 $ 12,700
Marine Services                  
Business Acquisition [Line Items]                  
Disposition of subsidiary $ (31,300)                
Ownership percentage before sale of stock     100.00%            
Consideration to be received   $ 140,000         $ 250,000    
Potential earn-out, maximum             12,500    
Consideration held in escrow for future losses payable             1,250    
Consideration held of escrow for purchase price adjustment             1,910    
Consideration to be paid on the earlier of December 31, 2020 or the date on which a cash collateralized bond in connection with Company's bonding facility is released             $ 2,400    
Proceeds from divestiture of businesses 144,000                
Proceeds from Divestiture of Businesses, Net of Cash Divested 98,600                
Loss on sale of subsidiary (39,300)                
Proceeds from Divestiture of Businesses, Cash Held For Operations 3,100                
Marine Services | Non- controlling Interest                  
Business Acquisition [Line Items]                  
Cash Divested from Deconsolidation 36,800                
Marine Services | Noncontrolling Interest Redeemable [Member]                  
Business Acquisition [Line Items]                  
Cash Divested from Deconsolidation $ 5,500                
Marine Services                  
Business Acquisition [Line Items]                  
Parents interest, controlling   49.00%              
Marine Services | Scenario, Forecast                  
Business Acquisition [Line Items]                  
Parents interest, controlling           30.00%      
New Saxon 2019 Limited                  
Business Acquisition [Line Items]                  
Parents interest, controlling       30.00%     73.00%    
New Saxon 2019 Limited | Scenario, Forecast                  
Business Acquisition [Line Items]                  
Parents interest, controlling           19.00%      
Huawei Marine Networks [Member]                  
Business Acquisition [Line Items]                  
Ownership percentage before sale of stock   49.00%