Segment Information (Tables)

12 Months Ended

Dec. 31, 2015

Segment Information [Abstract]

Schedule Of Segment Reporting Information

2015
			Onshore
	Drilling		Completion
	Products and		and Workover		Production		Technical				Consolidated
	Services		Services		Services		Solutions		Unallocated		Total
Revenues	$	583,139	$	934,274	$	759,606	$	497,546	$	-	$	2,774,565
Cost of services and rentals
(exclusive of items shown separately below)		196,921		773,119		594,286		301,486		-		1,865,812
Depreciation, depletion, amortization     and accretion		194,061		225,667		130,267		62,152		-		612,147
General and administrative expenses		127,525		121,289		139,304		122,590		-		510,708
Reduction in value of assets		40,237		783,229		790,517		124,904		-		1,738,887
Income (loss) from operations		24,395		(969,030)		(894,768)		(113,586)		-		(1,952,989)
Interest expense, net		-		-		(2,013)		1,707		(97,012)		(97,318)
Other expense		-		-		-		-		(9,476)		(9,476)
Income (loss) from continuing operations     before income taxes	$	24,395	$	(969,030)	$	(896,781)	$	(111,879)	$	(106,488)	$	(2,059,783)

2014
			Onshore
	Drilling		Completion
	Products and		and Workover		Production		Technical				Consolidated
	Services		Services		Services		Solutions		Unallocated		Total
Revenues	$	904,358	$	1,732,833	$	1,350,956	$	568,475	$	-	$	4,556,622
Cost of services and rentals
(exclusive of items shown separately below)		282,023		1,205,443		941,030		306,337		-		2,734,833
Depreciation, depletion, amortization     and accretion		186,642		233,430		164,672		66,070		-		650,814
General and administrative expenses		149,967		159,687		187,526		127,191		-		624,371
Income from operations		285,726		134,273		57,728		68,877		-		546,604
Interest expense, net		-		-		-		1,577		(98,311)		(96,734)
Other expense		-		-		-		-		(7,681)		(7,681)
Income (loss) from continuing operations     before income taxes	$	285,726	$	134,273	$	57,728	$	70,454	$	(105,992)	$	442,189

2013
			Onshore
	Drilling		Completion
	Products and		and Workover		Production		Technical				Consolidated
	Services		Services		Services		Solutions		Unallocated		Total
Revenues	$	820,538	$	1,607,268	$	1,434,990	$	487,261	$	-	$	4,350,057
Cost of services and rentals
(exclusive of items shown separately below)		268,127		1,091,956		1,002,628		270,879		-		2,633,590
Depreciation, depletion, amortization     and accretion		168,391		216,152		177,532		42,366		-		604,441
General and administrative expenses		136,244		158,448		190,647		112,439		-		597,778
Reduction in value of assets		2,292		16,975		28,568		252,243		-		300,078
Income (loss) from operations		245,484		123,737		35,615		(190,666)		-		214,170
Interest expense, net		-		-		-		1,323		(109,225)		(107,902)
Other income (expense)		-		-		-		836		(6,347)		(5,511)
Income (loss) from continuing operations     before income taxes	$	245,484	$	123,737	$	35,615	$	(188,507)	$	(115,572)	$	100,757

Schedule Of Identifiable Assets

Identifiable Assets
			Onshore
	Drilling		Completion
	Products and		and Workover		Production		Technical				Consolidated
	Services		Services		Services		Solutions		Unallocated		Total
December 31, 2015	$	1,223,191	$	1,929,185	$	967,719	$	794,149	$	-	$	4,914,244
December 31, 2014	$	1,284,842	$	2,993,824	$	2,098,592	$	940,524	$	-	$	7,317,782
December 31, 2013	$	1,237,842	$	2,961,390	$	2,158,653	$	1,009,058	$	-	$	7,366,943

Schedule of Capital Expenditures Table Text Block

Capital Expenditures
			Onshore
	Drilling		Completion
	Products and		and Workover		Production		Technical		Consolidated
	Services		Services		Services		Solutions		Total
December 31, 2015	$	129,504	$	103,001	$	72,048	$	53,673	$	358,226
December 31, 2014	$	274,752	$	152,742	$	88,870	$	99,738	$	616,102
December 31, 2013	$	246,479	$	101,854	$	122,946	$	137,681	$	608,960

Schedule Of Revenues By Geographic Segment

Revenues
	Years Ended December 31,
	2015		2014		2013
United States	$	2,185,071	$	3,848,929	$	3,674,825
Other Countries		589,494		707,693		675,232
Total	$	2,774,565	$	4,556,622	$	4,350,057
Long-Lived Assets
			December 31,
			2015		2014
United States			$	1,799,418	$	2,416,306
Other Countries				323,873		317,533
Total, net			$	2,123,291	$	2,733,839