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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Information Report
Net sales	$ 116,738	$ 131,041	$ 257,335	$ 273,216
Gross profit	15,668	13,577	36,872	30,077
Operating income (loss)	9,380	6,970	24,200	16,149
Water Transmission [Member]
Segment Information Report
Net sales	58,148	59,050	136,761	117,481
Gross profit	12,125	8,149	31,995	17,848
Operating income (loss)	10,499	6,130	28,532	14,154
Tubular Products [Member]
Segment Information Report
Net sales	58,590	71,991	120,574	155,735
Gross profit	3,543	5,428	4,877	12,229
Operating income (loss)	2,885	4,651	3,551	10,847
Corporate [Member]
Segment Information Report
Operating income (loss)	$ (4,004)	$ (3,811)	$ (7,883)	$ (8,852)

X

- Definition

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

+ 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 210.5-03.1,2)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

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

+ References

No definition available.

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X

- 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)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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