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Summary of Significant Accounting Policies - Property, Plant and Equipment (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
item
Sep. 30, 2017
USD ($)
Property, Plant and Equipment          
Value of shares sold $ 21,800     $ 301,835 $ 8,300
Loss on sale of offshore rigs   $ 4,811 $ 10,009 $ 74,371 $ 10,142
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)  
Jack Up Rigs | Other, net          
Property, Plant and Equipment          
Loss on sale of offshore rigs       $ (63,700)