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Business Segment, Geographic and Major Customer Information - Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012 | Dec. 31, 2012
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | $ 98,388 | $ 78,628 | $ 270,217 | $ 236,126 |
Gross margin | 37,502 | 33,843 | 107,726 | 100,319 |
Income (loss) from operations | 15,087 | 14,593 | 41,166 | 46,930 |
Depreciation and amortization | 4,025 | 2,967 | 10,948 | 8,468 |
Total assets | 380,979 | 218,135 | 380,979 | 218,135 | 219,867
Capital expenditures | 2,475 | 5,765 | 9,985 | 15,243 |
Energy Chemical Technologies [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | 51,670 | 44,189 | 144,029 | 137,827 |
Gross margin | 21,849 | 20,774 | 61,548 | 61,856 |
Income (loss) from operations | 16,247 | 16,530 | 45,300 | 50,005 |
Depreciation and amortization | 932 | 460 | 2,201 | 1,321 |
Total assets | 121,876 | 53,076 | 121,876 | 53,076 |
Capital expenditures | 161 | 733 | 3,077 | 2,896 |
Consumer and Industrial Chemical Technologies [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | 15,292 | 0 | 27,967 | 0 |
Gross margin | 3,588 | 0 | 7,281 | 0 |
Income (loss) from operations | 2,301 | 0 | 4,648 | 0 |
Depreciation and amortization | 382 | 0 | 634 | 0 |
Total assets | 97,129 | 0 | 97,129 | 0 |
Capital expenditures | 165 | 0 | 165 | 0 |
Drilling Products [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | 27,569 | 30,424 | 86,268 | 89,214 |
Gross margin | 10,821 | 11,252 | 34,622 | 34,764 |
Income (loss) from operations | 4,309 | 5,329 | 15,510 | 17,320 |
Depreciation and amortization | 2,438 | 2,277 | 7,215 | 6,738 |
Total assets | 136,832 | 122,533 | 136,832 | 122,533 |
Capital expenditures | 1,596 | 2,384 | 4,066 | 7,724 |
Artificial Lift Technologies [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | 3,857 | 4,015 | 11,953 | 9,085 |
Gross margin | 1,244 | 1,817 | 4,275 | 3,699 |
Income (loss) from operations | 769 | 1,384 | 2,712 | 2,284 |
Depreciation and amortization | 60 | 54 | 181 | 148 |
Total assets | 16,542 | 10,563 | 16,542 | 10,563 |
Capital expenditures | 225 | 5 | 1,669 | 73 |
Corporate and Other [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | 0 | 0 | 0 | 0 |
Gross margin | 0 | 0 | 0 | 0 |
Income (loss) from operations | (8,539) | (8,650) | (27,004) | (22,679) |
Depreciation and amortization | 213 | 176 | 717 | 261 |
Total assets | 8,600 | 31,963 | 8,600 | 31,963 |
Capital expenditures | $ 328 | $ 2,643 | $ 1,008 | $ 4,550 |

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