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Business Segment, Geographic and Major Customer Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | $ 78,628 | $ 75,058 | $ 236,126 | $ 183,881 |
Gross margin | 33,843 | 30,717 | 100,319 | 74,106 |
Income (loss) from operations | 14,593 | 16,105 | 46,930 | 33,295 |
Depreciation and amortization | 2,968 | 2,568 | 8,468 | 7,532 |
Total assets | 218,135 | 211,028 | 218,135 | 211,028 | 232,012
Capital expenditures | 5,765 | 2,314 | 15,243 | 5,971 |
Chemicals [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | 44,189 | 43,639 | 137,827 | 99,707 |
Gross margin | 20,774 | 17,393 | 61,856 | 39,705 |
Income (loss) from operations | 16,530 | 13,795 | 50,005 | 30,586 |
Depreciation and amortization | 460 | 409 | 1,321 | 1,189 |
Total assets | 53,076 | 56,880 | 53,076 | 56,880 |
Capital expenditures | 733 | 928 | 2,896 | 1,090 |
Drilling [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | 30,424 | 26,963 | 89,214 | 74,068 |
Gross margin | 11,252 | 11,091 | 34,764 | 30,844 |
Income (loss) from operations | 5,329 | 5,585 | 17,320 | 16,187 |
Depreciation and amortization | 2,277 | 2,056 | 6,738 | 5,979 |
Total assets | 122,533 | 111,804 | 122,533 | 111,804 |
Capital expenditures | 2,384 | 945 | 7,724 | 3,900 |
Artificial Lift [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers | 4,015 | 4,456 | 9,085 | 10,106 |
Gross margin | 1,817 | 2,233 | 3,699 | 3,557 |
Income (loss) from operations | 1,384 | 1,811 | 2,284 | 2,205 |
Depreciation and amortization | 54 | 50 | 148 | 155 |
Total assets | 10,563 | 10,162 | 10,563 | 10,162 |
Capital expenditures | 5 | 38 | 73 | 48 |
Corporate [Member] |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |
Net revenue from external customers |  |  |  |  |
Gross margin |  |  |  |  |
Income (loss) from operations | (8,650) | (5,086) | (22,679) | (15,683) |
Depreciation and amortization | 177 | 53 | 261 | 209 |
Total assets | 31,963 | 32,182 | 31,963 | 32,182 |
Capital expenditures | $ 2,643 | $ 403 | $ 4,550 | $ 933 |

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