Annual report pursuant to Section 13 and 15(d)

Property, Plant and Equipment - Components of Property, Plant and Equipment and Depreciation Expense (Details)

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Property, Plant and Equipment - Components of Property, Plant and Equipment and Depreciation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment, at cost   $ 355,930 $ 1,486,169
Accumulated depreciation   (56,162) (951,798)
Property, plant, and equipment, net   299,768 534,371
Depreciation expense $ 24,525 57,174 105,239
Drilling equipment      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment, at cost   139,722 720,037
Rental tools      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment, at cost   164,592 581,107
Building, land and improvements      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment, at cost   25,636 58,193
Other      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment, at cost   15,902 115,977
Construction in progress      
Property, Plant and Equipment [Line Items]      
Total property, plant, and equipment, at cost   $ 10,078 $ 10,855