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Organization and Basis of Presentation (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
vessel
segment
Mar. 31, 2019
USD ($)
Apr. 23, 2020
USD ($)
Jul. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Loss on impairment $ 1,119,517 $ 0    
Number of drilling rigs (vessel) | vessel 24      
Number of floaters (vessel) | vessel 12      
Number of jackups (vessel) | vessel 12      
Number of reportable segments | segment 1      
Minimum | 2017 Credit Facility matures January 2023        
Debt Instrument [Line Items]        
Debt instrument, aggregate principal amount       $ 1,300,000
Line of credit | 2017 Credit Facility matures January 2023        
Debt Instrument [Line Items]        
Current borrowing capacity $ 397,800      
Line of credit | Subsequent Event | 2017 Credit Facility matures January 2023        
Debt Instrument [Line Items]        
Current borrowing capacity     $ 1,050,000  
Borrowings outstanding or letters of credit issued     545,000  
Remaining borrowing capacity     $ 297,800