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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Information Report                      
Net sales $ 136,188 $ 115,099 $ 131,041 $ 142,175 $ 117,144 $ 139,265 $ 143,801 $ 111,458 $ 524,503 $ 511,668 $ 386,750
Gross profit 14,521 11,600 13,577 16,500 11,185 16,514 16,671 14,768 56,198 59,138 29,688
Operating income (Loss) 7,382 4,029 6,970 9,179 4,229 10,047 11,068 7,479 27,560 32,823 595
Operating income (loss), Reportable Segments                 44,613 46,773 17,788
Depreciation and amortization of property and equipment                 16,267 14,471 13,680
Depreciation and amortization expense, Reportable Segments                 16,015 14,452 13,287
Capital expenditures                 16,789 16,333 18,597
Capital expenditures, reportable segments                 16,643 16,151 18,442
Water Transmission [Member]
                      
Segment Information Report                      
Net sales 88,235 63,487 59,050 58,431 61,828 76,953 74,459 58,645 269,203 271,885 221,251
Gross profit 17,522 9,681 8,149 9,699 8,412 13,345 11,531 9,894 45,051 43,182 19,430
Operating income (Loss) 15,155 6,969 6,130 8,024 5,963 10,747 9,142 8,261 36,278 34,113 10,825
Depreciation and amortization of property and equipment                 10,474 8,729 8,282
Capital expenditures                 6,830 4,765 9,307
Tubular Products [Member]
                      
Segment Information Report                      
Net sales 47,953 51,612 71,991 83,744 55,316 62,312 69,342 52,813 255,300 239,783 165,499
Gross profit (3,001) 1,919 5,428 6,801 2,773 3,169 5,140 4,874 11,147 15,956 10,258
Operating income (Loss) (3,646) 1,134 4,651 6,196 2,158 2,349 4,304 3,849 8,335 12,660 6,963
Depreciation and amortization of property and equipment                 5,541 5,723 5,005
Capital expenditures                 9,813 11,386 9,135
Corporate [Member]
                      
Segment Information Report                      
Operating income (Loss) (4,127) (4,074) (3,811) (5,041) (3,892) (3,049) (2,378) (4,631) (17,053) (13,950) (17,193)
Depreciation and amortization of property and equipment                 252 69 579
Capital expenditures                 146 182 155
Other [Member]
                      
Segment Information Report                      
Net sales, Other                 51,100 56,043 39,722
United States [Member]
                      
Segment Information Report                      
Net sales, United States                 $ 473,403 $ 455,625 $ 347,028