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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

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