Summary Of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

Summary Of Significant Accounting Policies [Abstract]

Schedule of Inventory, Current [Table Text Block]

	December 31,
	2016		2015
Finished goods	$	49,888	$	71,951
Raw materials		17,948		23,418
Work-in-process		5,214		18,203
Supplies and consumables		30,029		35,189
Total	$	103,079	$	148,761

Estimated Useful Lives Of The Related Assets

Buildings and improvements	5	to	40	years
Marine vessels and equipment	5	to	25	years
Machinery and equipment	2	to	25	years
Automobiles, trucks, tractors and trailers	3	to	10	years
Furniture and fixtures	2	to	10	years

Summary Of Activity Of Goodwill

			Onshore
	Drilling		Completion
	Products		and Workover		Production
	and Services		Services		Services		Total
Balance, December 31, 2014	$	142,839	$	1,419,550	$	906,020	$	2,468,409
Acquisition activities		-		-		1,170		1,170
Reduction in value of assets		-		(740,000)		(586,701)		(1,326,701)
Foreign currency translation adjustment		(1,557)		-		(1,220)		(2,777)
Other		-		44,000		(44,000)		-
Balance, December 31, 2015		141,282		723,550		275,269		1,140,101
Reduction in value of assets		-		(140,000)		(190,500)		(330,500)
Foreign currency translation adjustment		(5,321)		-		(363)		(5,684)
Balance, December 31, 2016	$	135,961	$	583,550	$	84,406	$	803,917

Composition Of Intangible And Other Long-term Assets

		December 31,
		2016						2015
	Estimated	Gross		Accumulated		Net		Gross		Accumulated		Net
	Useful Lives	Amount		Amortization		Balance		Amount		Amortization		Balance
Customer relationships	17 years	$	164,603	$	(52,747)	$	111,856	$	257,364	$	(65,209)	$	192,155
Tradenames	10 years		30,519		(14,123)		16,396		36,119		(15,371)		20,748
Non-compete agreements	3 years		2,790		(2,718)		72		3,242		(2,940)		302
Total		$	197,912	$	(69,588)	$	128,324	$	296,725	$	(83,520)	$	213,205

Summary Of The Activity For Company's Decommissioning Liabilities

	December 31,
	2016		2015
Decommissioning liabilities, December 31, 2015 and 2014, respectively	$	117,942	$	88,000
Revisions in estimated timing and cash flows		(2,132)		24,660
Accretion		6,959		5,016
Liability acquisitions and dispositions		908		266
Total decommissioning liabilities, December 31, 2016 and 2015, respectively	$	123,677	$	117,942