Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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The aggregate direct operating costs incurred during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Revenue from oil and gas-related services including well services (such as drilling, rigs and analytic evaluations), transportation, and other supporting contractor services, during the reporting period.

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Business Segment Information (Schedule Of Reportable Segments Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Operating revenues	$ 400,911us-gaap_RevenueOilAndGasServices	$ 393,955us-gaap_RevenueOilAndGasServices	$ 359,662us-gaap_RevenueOilAndGasServices	$ 336,756us-gaap_RevenueOilAndGasServices	$ 308,033us-gaap_RevenueOilAndGasServices	$ 324,797us-gaap_RevenueOilAndGasServices	$ 325,723us-gaap_RevenueOilAndGasServices	$ 304,351us-gaap_RevenueOilAndGasServices	$ 1,491,284us-gaap_RevenueOilAndGasServices	$ 1,262,904us-gaap_RevenueOilAndGasServices	$ 1,374,884us-gaap_RevenueOilAndGasServices
Direct operating costs									(1,011,419)us-gaap_DirectOperatingCosts	(868,088)us-gaap_DirectOperatingCosts	(902,584)us-gaap_DirectOperatingCosts
Segment profits	128,729us-gaap_GrossProfit	129,835us-gaap_GrossProfit	116,732us-gaap_GrossProfit	104,569us-gaap_GrossProfit	96,248us-gaap_GrossProfit	102,054us-gaap_GrossProfit	103,211us-gaap_GrossProfit	93,303us-gaap_GrossProfit	479,865us-gaap_GrossProfit	394,816us-gaap_GrossProfit	472,300us-gaap_GrossProfit
Depreciation and amortization									217,480	209,747	187,083
Capital expenditures, (excluding acquisitions)									311,494	187,515	171,440
Identifiable assets	1,597,177us-gaap_Assets				1,543,339us-gaap_Assets				1,597,177us-gaap_Assets	1,543,339us-gaap_Assets	1,599,006us-gaap_Assets
Completion and Remedial Services
Segment Reporting Information [Line Items]
Operating revenues									698,917	501,137	586,070
Direct operating costs									(434,457)	(327,540)	(357,960)
Segment profits									264,460	173,597	228,110
Depreciation and amortization									74,924	62,609	56,043
Capital expenditures, (excluding acquisitions)									168,017	59,345	58,235
Identifiable assets	514,842				432,267				514,842	432,267	444,504
Fluid Services
Segment Reporting Information [Line Items]
Operating revenues									369,774	343,863	352,246
Direct operating costs									(265,105)	(239,154)	(236,588)
Segment profits									104,669	104,709	115,658
Depreciation and amortization									64,445	63,316	52,331
Capital expenditures, (excluding acquisitions)									71,112	66,992	33,637
Identifiable assets	299,542				320,404				299,542	320,404	286,662
Well Servicing
Segment Reporting Information [Line Items]
Operating revenues									361,683	363,386	376,268
Direct operating costs									(270,344)	(265,058)	(268,219)
Segment profits									91,339	98,328	108,049
Depreciation and amortization									55,131	60,474	56,310
Capital expenditures, (excluding acquisitions)									54,858	39,001	42,641
Identifiable assets	276,696				289,017				276,696	289,017	303,901
Contract Drilling
Segment Reporting Information [Line Items]
Operating revenues									60,910	54,518	60,300
Direct operating costs									(41,513)	(36,336)	(39,817)
Segment profits									19,397	18,182	20,483
Depreciation and amortization									12,773	12,815	12,350
Capital expenditures, (excluding acquisitions)									9,311	4,576	12,141
Identifiable assets	60,362				59,868				60,362	59,868	64,127
Corporate and Other
Segment Reporting Information [Line Items]
Depreciation and amortization									10,207	10,533	10,049
Capital expenditures, (excluding acquisitions)									8,196	17,601	24,786
Identifiable assets	$ 445,735				$ 441,783				$ 445,735	$ 441,783	$ 499,812