Note 13 - Segment and Related Information (Details) - Financial Information by Segment (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues
Revenues	$ 1,118,416us-gaap_SalesRevenueNet	$ 1,042,356us-gaap_SalesRevenueNet	$ 983,953us-gaap_SalesRevenueNet
Operating Income (loss)
Operating Income	130,596us-gaap_OperatingIncomeLoss	94,445us-gaap_OperatingIncomeLoss	92,275us-gaap_OperatingIncomeLoss
Segment Assets
Segment Assets	1,020,122us-gaap_Assets	968,417us-gaap_Assets	994,541us-gaap_Assets
Assets of discontinued operations		79,020
Depreciation and Amortization	42,030	44,198	32,821
Fluids Systems & Engineering [Member] \| Continuing Operations [Member]
Segment Assets
Depreciation and Amortization	22,934	26,679	18,419
Capital Expenditures	36,626	39,316	27,916
Fluids Systems & Engineering [Member]
Revenues
Revenues	965,049	926,392	861,670
Operating Income (loss)
Operating Income	95,600	72,604	59,987
Segment Assets
Segment Assets	778,148	733,340	790,147
Mats and Integrated Services [Member] \| Continuing Operations [Member]
Segment Assets
Depreciation and Amortization	15,507	10,501	7,952
Capital Expenditures	64,101	26,455	8,174
Mats and Integrated Services [Member]
Revenues
Revenues	153,367	115,964	122,283
Operating Income (loss)
Operating Income	70,526	49,394	54,251
Segment Assets
Segment Assets	175,318	112,619	81,252
Corporate Segment [Member] \| Continuing Operations [Member]
Segment Assets
Depreciation and Amortization	2,734	2,584	2,575
Capital Expenditures	5,215	464	6,307
Corporate Segment [Member]
Operating Income (loss)
Operating Income	(35,530)	(27,553)	(21,963)
Segment Assets
Segment Assets	66,656	43,438	43,866
Continuing Operations [Member]
Segment Assets
Depreciation and Amortization	41,175	39,764	28,946
Capital Expenditures	105,942	66,235	42,397
Discontinued Operations [Member]
Segment Assets
Assets of discontinued operations		$ 79,020	$ 79,276

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.18)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Name Regulation S-X (SX)

-Number 210

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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- Definition

Amount classified as assets attributable to disposal group held for sale or disposed of.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Paragraph 28

-Subparagraph (b)

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The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

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Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

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