Business Segment Information (Schedule Of Reportable Segments Financial Information) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating revenues	$ 261,721us-gaap_RevenueOilAndGasServices	$ 336,756us-gaap_RevenueOilAndGasServices
Direct operating costs	(195,309)us-gaap_DirectOperatingCosts	(232,187)us-gaap_DirectOperatingCosts
Segment profits	66,412us-gaap_GrossProfit	104,569us-gaap_GrossProfit
Depreciation and amortization	60,929	51,705
Capital expenditures, (excluding acquisitions)	34,138	37,034
Identifiable assets	1,499,550us-gaap_Assets	1,525,015us-gaap_Assets	1,597,177us-gaap_Assets
Completion and Remedial Services
Segment Reporting Information [Line Items]
Operating revenues	112,775	137,485
Direct operating costs	(81,251)	(86,480)
Segment profits	31,524	51,005
Depreciation and amortization	21,454	15,727
Capital expenditures, (excluding acquisitions)	14,171	16,567
Identifiable assets	495,892	431,291
Fluid Services
Segment Reporting Information [Line Items]
Operating revenues	73,803	92,835
Direct operating costs	(54,132)	(66,782)
Segment profits	19,671	26,053
Depreciation and amortization	17,776	16,063
Capital expenditures, (excluding acquisitions)	6,226	9,628
Identifiable assets	292,438	311,905
Well Servicing
Segment Reporting Information [Line Items]
Operating revenues	63,668	92,912
Direct operating costs	(52,401)	(69,759)
Segment profits	11,267	23,153
Depreciation and amortization	15,268	13,980
Capital expenditures, (excluding acquisitions)	10,351	8,062
Identifiable assets	271,202	265,870
Contract Drilling
Segment Reporting Information [Line Items]
Operating revenues	11,475	13,524
Direct operating costs	(7,525)	(9,166)
Segment profits	3,950	4,358
Depreciation and amortization	3,562	3,210
Capital expenditures, (excluding acquisitions)	874	908
Identifiable assets	59,319	57,734
Corporate and Other
Segment Reporting Information [Line Items]
Depreciation and amortization	2,869	2,725
Capital expenditures, (excluding acquisitions)	2,516	1,869
Identifiable assets	$ 380,699	$ 458,215

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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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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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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