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Quarterly Data (Details) (USD $)
In Thousands, except Per Share data, 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
Net income (loss) 4,510 3,396 3,604 4,734 1,467 3,284 4,977 2,932 16,244 12,660 (5,440)
Earnings (loss) per common share:                      
Basic earnings (loss) per share $ 0.48 $ 0.36 $ 0.38 $ 0.51 $ 0.16 $ 0.35 $ 0.53 $ 0.32 $ 1.73 $ 1.36 $ (0.59)
Diluted earnings (loss) per share $ 0.48 $ 0.36 $ 0.38 $ 0.50 $ 0.15 $ 0.35 $ 0.53 $ 0.31 $ 1.72 $ 1.35 $ (0.59)
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
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
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)