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Contingencies (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended
Mar. 09, 2020
Jul. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]        
Decline in backlog as a result of potential contract termination $ 150,000,000      
Loss of hire insurance, per day     $ 602,500  
Loss Contingency, Damages Sought, Value   $ 100,000,000    
Maximum Contingent Contributions To Joint Venture     1,250,000,000  
Gain (Loss) Related to Litigation Settlement       $ 20,300,000
Letters of credit outstanding, amount     117,900,000  
Middle East & Africa        
Loss Contingencies [Line Items]        
Proceeds from Legal Settlements     $ 27,500,000