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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues: |  |  |
Product sales | $ 300,145 | $ 276,155 | $ 329,489
Services and rentals | 609,253 | 604,676 | 515,786
Total revenues | 909,398 | 880,831 | 845,275
Cost of revenues: |  |  |
Cost of product sales | 282,704 | 242,297 | 306,953
Cost of services and rentals | 400,739 | 387,047 | 338,703
Depreciation, depletion, amortization, and accretion | 80,985 | 75,747 | 94,839
Impairments of long-lived assets | 9,578 | 8,360 | 15,738
Total cost of revenues | 774,006 | 713,451 | 756,233
Gross profit | 135,392 | 167,380 | 89,042
General and administrative expense | 131,466 | 131,649 | 111,805
Interest expense, net | 17,121 | 17,080 | 16,439
(Gain) loss on sales of assets | (5,776) | (4,916) | (58,674)
Other (income) expense, net | (7,291) | (4,616) | 13,239
Income (loss) before taxes and discontinued operations | (128) | 28,183 | 6,233
Provision (benefit) for income taxes | (3,454) | 9,429 | 751
Income (loss) before discontinued operations | 3,326 | 18,754 | 5,482
Discontinued operations: |  |  |
Income (loss) from discontinued operations, net of taxes | (1) | 3 | (64)
Net income (loss) | 3,325 | 18,757 | 5,418
Less: income attributable to noncontrolling interest | (3,172) | (2,797) | (1,271)
Net income (loss) attributable to TETRA stockholders | $ 153 | $ 15,960 | $ 4,147
Basic net income (loss) per common share: |  |  |
Income (loss) before discontinued operations attributable to TETRA stockholders | $ 0.00 | $ 0.21 | $ 0.05
Income (loss) from discontinued operations attributable to TETRA stockholders | $ 0.00 | $ 0.00 | $ 0.00
Net income (loss) attributable to TETRA stockholders | $ 0.00 | $ 0.21 | $ 0.05
Average shares outstanding | 77,954 | 77,293 | 76,616
Diluted net income (loss) per common share: |  |  |
Income (loss) before discontinued operations attributable to TETRA stockholders | $ 0.00 | $ 0.20 | $ 0.05
Income (loss) from discontinued operations attributable to TETRA stockholders | $ 0.00 | $ 0.00 | $ 0.00
Net income (loss) attributable to TETRA stockholders | $ 0.00 | $ 0.20 | $ 0.05
Average diluted shares outstanding | 78,840 | 77,963 | 77,991

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