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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)

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- 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 + Details
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