Impairments and Other Charges (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($) item
Goodwill And Intangible Assets:
Goodwill impairments	$ 93,600		$ 93,634
Intangible asset impairment			5,235
Subtotal			98,869	$ 16,530
Other Charges:
Divestiture of International assets				63,726
Severance and transaction related costs	2,911	$ 1,753	5,386	12,526
Tangible asset impairments		1,541		3,706
Loss (gain) on early extinguishment of debt	718	10,476	1,752	10,476
Total impairments and other charges	3,629	13,770	106,007	90,434
Payment of long-term debt			379,193	774,802
Write-off of receivable			379	(2,568)
International Drilling
Goodwill And Intangible Assets:
Goodwill impairments			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
Senior Notes.
Other Charges:
Principal amount redeemed	$ 16,600	$ 460,800	$ 378,100	$ 460,800