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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement [Abstract] |  |  |
Revenue | $ 373,598 | $ 364,706 | $ 316,910
Cost of revenue | 215,708 | 214,539 | 184,683
Gross profit | 157,890 | 150,167 | 132,227
Operating expenses: |  |  |
Research and development and engineering | 31,043 | 28,954 | 23,787
Selling, general and administrative | 82,049 | 84,380 | 76,337
Amortization of purchased intangible assets | 7,611 | 10,262 | 7,270
Restructuring, acquisition and divestiture related costs | 8,254 | 1,935 | 5,387
Impairment of goodwill and intangible assets |  | 41,442 |
Total operating expenses | 128,957 | 166,973 | 112,781
Operating income (loss) from continuing operations | 28,933 | (16,806) | 19,446
Interest income (expense), net | (5,180) | (5,096) | (3,468)
Foreign exchange transaction gains (losses), net | (23) | 1,281 | (1,301)
Other income (expense), net | 2,663 | 2,706 | 1,500
Gain on disposal of business | 19,629 |  |
Income (loss) from continuing operations before income taxes | 46,022 | (17,915) | 16,177
Income tax provision (benefit) | 10,394 | (1,006) | 6,200
Income (loss) from continuing operations | 35,628 | (16,909) | 9,977
Loss from discontinued operations, net of tax | (13) | (5,607) | (2,054)
Loss on disposal of discontinued operations, net of tax |  | (1,726) | (592)
Consolidated net income (loss) | 35,615 | (24,242) | 7,331
Less: Net income attributable to noncontrolling interest |  | (10) | (22)
Net income (loss) attributable to GSI Group Inc. | $ 35,615 | $ (24,252) | $ 7,309
Earnings (loss) per common share from continuing operations: |  |  |
Basic | $ 1.03 | $ (0.49) | $ 0.29
Diluted | 1.02 | (0.49) | 0.29
Loss per common share from discontinued operations: |  |  |
Basic | 0.00 | (0.21) | (0.08)
Diluted | 0.00 | (0.21) | (0.08)
Earnings (loss) per common share attributable to GSI Group Inc.: |  |  |
Basic | 1.03 | (0.70) | 0.21
Diluted | $ 1.02 | $ (0.70) | $ 0.21
Weighted average common shares outstanding—basic | 34,579 | 34,352 | 34,073
Weighted average common shares outstanding—diluted | 34,827 | 34,352 | 34,396
Amounts attributable to GSI Group Inc.: |  |  |
Income (loss) from continuing operations | $ 35,628 | $ (16,909) | $ 9,977
Loss from discontinued operations | (13) | (7,343) | (2,668)
Net income (loss) attributable to GSI Group Inc. | $ 35,615 | $ (24,252) | $ 7,309

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