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Segment Information (Reportable Segments) (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
Summarized financial information regarding reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue from external customers | $ 76,702 | $ 78,628 | $ 78,303 | $ 79,195 | $ 74,904 | $ 75,058 | $ 55,918 | $ 52,905 | $ 312,828 | $ 258,785 | $ 146,982
Gross margin | 31,300 | 33,843 | 33,025 | 33,451 | 31,714 | 30,717 | 22,244 | 21,145 | 131,619 | 105,820 | 52,970
Income (loss) from operations |  |  |  |  |  |  |  |  | 58,621 | 48,888 | (6,267)
Depreciation and amortization |  |  |  |  |  |  |  |  | 11,583 | 10,105 | 13,768
Total assets | 219,867 |  |  |  | 232,012 |  |  |  | 219,867 | 232,012 | 184,807
Capital expenditures |  |  |  |  |  |  |  |  | 20,701 | 9,984 | 6,060
Chemicals and Logistics [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue from external customers |  |  |  |  |  |  |  |  | 183,986 | 140,836 | 66,121
Gross margin |  |  |  |  |  |  |  |  | 81,438 | 56,115 | 29,249
Income (loss) from operations |  |  |  |  |  |  |  |  | 65,440 | 43,549 | 19,833
Depreciation and amortization |  |  |  |  |  |  |  |  | 1,765 | 1,594 | 1,671
Total assets | 59,195 |  |  |  | 54,958 |  |  |  | 59,195 | 54,958 | 44,102
Capital expenditures |  |  |  |  |  |  |  |  | 3,553 | 2,231 | 1,227
Drilling [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue from external customers |  |  |  |  |  |  |  |  | 116,736 | 102,470 | 65,782
Gross margin |  |  |  |  |  |  |  |  | 45,709 | 43,607 | 18,991
Income (loss) from operations |  |  |  |  |  |  |  |  | 22,282 | 23,035 | (9,738)
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,115 | 8,061 | 11,445
Total assets | 118,771 |  |  |  | 113,130 |  |  |  | 118,771 | 113,130 | 102,949
Capital expenditures |  |  |  |  |  |  |  |  | 12,264 | 6,025 | 4,679
Artificial Lift [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue from external customers |  |  |  |  |  |  |  |  | 12,106 | 15,479 | 15,079
Gross margin |  |  |  |  |  |  |  |  | 4,472 | 6,098 | 4,730
Income (loss) from operations |  |  |  |  |  |  |  |  | 3,395 | 4,296 | 3,070
Depreciation and amortization |  |  |  |  |  |  |  |  | 206 | 196 | 219
Total assets | 11,189 |  |  |  | 10,815 |  |  |  | 11,189 | 10,815 | 9,062
Capital expenditures |  |  |  |  |  |  |  |  | 77 | 182 | 32
Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Summarized financial information regarding reportable segments |  |  |  |  |  |  |  |  |  |  |
Net revenue from external customers |  |  |  |  |  |  |  |  | 0 | 0 | 0
Gross margin |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income (loss) from operations |  |  |  |  |  |  |  |  | (32,496) | (21,992) | (19,432)
Depreciation and amortization |  |  |  |  |  |  |  |  | 497 | 254 | 433
Total assets | 30,712 |  |  |  | 53,109 |  |  |  | 30,712 | 53,109 | 28,694
Capital expenditures |  |  |  |  |  |  |  |  | $ 4,807 | $ 1,546 | $ 122

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