Impairments and Other Charges (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) item	Jun. 30, 2018 USD ($)
Goodwill And Intangible Assets:
Goodwill impairments	$ 93,634		$ 93,634
Intangible asset impairment	5,235		5,235
Subtotal	98,869		98,869	$ 63,726
Other Charges:
Divestiture of International assets		$ 63,726		63,726
Transaction related costs		5,894		12,938
Loss (gain) on early extinguishment of debt	3,701		1,034
Total impairments and other charges	102,570	$ 69,620	99,903	76,664
Principal amount redeemed	361,500		361,500
Payment of long-term debt			361,966	460,837
Gain on debt repurchase	(3,701)		(1,034)
Write-off of receivable			256	$ (2,663)
International Drilling
Goodwill And Intangible Assets:
Goodwill impairments	75,600		75,600
Other Charges:
Divestiture of International assets			$ 63,700
Number of offshore drilling rigs sold | item			3
Rig Technologies
Goodwill And Intangible Assets:
Goodwill impairments	18,000		$ 18,000
Senior Notes.
Other Charges:
Principal amount redeemed	$ 315,300		$ 361,500