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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
item
Jun. 30, 2017
USD ($)
Property, Plant and Equipment          
Value of shares sold $ 21,800     $ 302,014 $ 8,300
Loss on sale of offshore rigs   $ 67,320 $ (2,742) $ 69,577 $ 133
Jack Up Rigs          
Property, Plant and Equipment          
Number of offshore rigs sold | item       3  
Sale of offshore jackup rigs in cash $ 61,400        
Loss on sale of offshore rigs   (63,700)   $ (63,700)  
Jack Up Rigs | Other, net          
Property, Plant and Equipment          
Loss on sale of offshore rigs   $ (63,700)   $ (63,700)