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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue: |  |  |  |
Revenues | $ 238,390 | $ 226,870 | $ 474,549 | $ 438,910
Total cost of sales (excluding depreciation and amortization) | 112,736 | 118,602 | 231,373 | 225,534
Selling, general and administrative | 28,618 | 26,649 | 57,607 | 54,157
Depreciation and amortization | 45,482 | 43,331 | 89,588 | 87,786
Long-lived asset impairment | 8,632 | 6,953 | 11,724 | 11,663
Restatement and other charges | 24 | (1,076) | 445 | (591)
Interest expense | 25,954 | 23,337 | 49,571 | 45,884
Debt extinguishment loss | 3,653 | 2,450 | 3,653 | 2,450
Transaction-related costs | 2,687 | 5,686 | 2,867 | 9,811
Other income, net | (2,010) | (1,644) | (2,215) | (2,789)
Income before income taxes | 12,614 | 2,582 | 29,936 | 5,005
Provision for (benefit from) income taxes | 1,191 | (1,567) | (1,216) | (1,213)
Income from continuing operations | 11,423 | 4,149 | 31,152 | 6,218
Loss from discontinued operations, net of tax | 0 | 0 | (273) | 0
Net income | 11,423 | 4,149 | 30,879 | 6,218
Less: Net income attributable to the noncontrolling interest | 0 | (2,212) | 0 | (8,097)
Net income (loss) attributable to Archrock stockholders | $ 11,423 | $ 1,937 | $ 30,879 | $ (1,879)
Basic and diluted net income (loss) per common share attributable to Archrock common stockholders (in dollars per share) | $ 0.09 | $ 0.02 | $ 0.24 | $ (0.02)
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 128,328 | 111,296 | 128,261 | 90,589
Diluted (in shares) | 128,354 | 111,402 | 128,297 | 90,589
Contract Operations | Contract operations |  |  |  |
Revenue: |  |  |  |
Revenues | $ 186,258 | $ 165,450 | $ 368,765 | $ 326,647
Total cost of sales (excluding depreciation and amortization) | 70,521 | 67,809 | 145,256 | 132,404
Aftermarket Services | Aftermarket services |  |  |  |
Revenue: |  |  |  |
Revenues | 52,132 | 61,420 | 105,784 | 112,263
Total cost of sales (excluding depreciation and amortization) | $ 42,215 | $ 50,793 | $ 86,117 | $ 93,130

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