Summary Of Significant Accounting Policies (Summary Of Activity Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Beginning Balance	$ 807,860	$ 803,917
Foreign currency translation adjustments	(2,234)	3,943
Reduction in value of assets	(668,838)		$ (330,500)
Ending Balance	136,788	807,860	803,917
Drilling Products And Services [Member]
Goodwill [Roll Forward]
Beginning Balance	138,493	135,961
Foreign currency translation adjustments	(1,705)	2,532
Ending Balance	136,788	138,493	135,961
Onshore Completion And Workover Services [Member]
Goodwill [Roll Forward]
Beginning Balance	583,550	583,550
Reduction in value of assets	(583,550)		(140,000)
Ending Balance		583,550	583,550
Production Services [Member]
Goodwill [Roll Forward]
Beginning Balance	85,817	84,406
Foreign currency translation adjustments	(529)	1,411
Reduction in value of assets	$ (85,288)		(190,500)
Ending Balance		$ 85,817	$ 84,406

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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