Summary Of Significant Accounting Policies (Summary Of Activity Of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill [Roll Forward]
Beginning Balance	$ 2,468,409	$ 2,458,109
Acquisition activities	1,170	13,909
Reduction in value of assets	(1,326,701)		$ (91,016)
Foreign currency translation adjustments	(2,777)	(3,609)
Ending Balance	1,140,101	2,468,409	2,458,109
Drilling Products And Services [Member]
Goodwill [Roll Forward]
Beginning Balance	142,839	144,872
Foreign currency translation adjustments	(1,557)	(2,033)
Ending Balance	141,282	142,839	144,872
Onshore Completion Services [Member]
Goodwill [Roll Forward]
Beginning Balance	1,419,550	1,419,550
Reduction in value of assets	(740,000)
Additional consideration paid for prior acquisitions	44,000
Ending Balance	723,550	1,419,550	1,419,550
Goodwill, Other Changes	44,000
Production Services [Member]
Goodwill [Roll Forward]
Beginning Balance	906,020	893,687
Acquisition activities	1,170	13,909
Reduction in value of assets	(586,701)
Additional consideration paid for prior acquisitions	(44,000)
Foreign currency translation adjustments	(1,220)	(1,576)
Ending Balance	275,269	$ 906,020	$ 893,687
Goodwill, Other Changes	$ (44,000)