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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue: |  |  |  |
Revenues | $ 226,870 | $ 197,982 | $ 438,910 | $ 387,867
Costs and expenses: |  |  |  |
Selling, general and administrative | 26,649 | 25,162 | 54,157 | 52,715
Depreciation and amortization | 43,331 | 47,248 | 87,786 | 95,020
Long-lived asset impairment | 6,953 | 5,508 | 11,663 | 13,753
Restatement and other charges | (1,076) | 1,920 | (591) | 2,721
Restructuring and other charges | 0 | 366 | 0 | 823
Interest expense | 23,337 | 22,504 | 45,884 | 43,925
Debt extinguishment costs | 2,450 | 0 | 2,450 | 291
Merger-related costs | 5,686 | 0 | 9,811 | 0
Other income, net | (1,644) | (962) | (2,789) | (1,756)
Total costs and expenses | 224,288 | 203,598 | 433,905 | 407,173
Income (loss) before income taxes | 2,582 | (5,616) | 5,005 | (19,306)
Benefit from income taxes | (1,567) | (1,580) | (1,213) | (1,257)
Net income (loss) | 4,149 | (4,036) | 6,218 | (18,049)
Less: Net income attributable to the noncontrolling interest | (2,212) | (2,651) | (8,097) | (323)
Net income (loss) attributable to Archrock stockholders | $ 1,937 | $ (6,687) | $ (1,879) | $ (18,372)
Basic and diluted net income (loss) per common share: |  |  |  |
Net income (loss) attributable to Archrock common stockholders (in dollars per share) | $ 0.02 | $ (0.10) | $ (0.02) | $ (0.27)
Weighted average common shares outstanding: |  |  |  |
Basic (in shares) | 111,296 | 69,588 | 90,589 | 69,496
Diluted (in shares) | 111,402 | 69,588 | 90,589 | 69,496
Dividends declared and paid per common share (in dollars per share) | $ 0.12 | $ 0.1200 | $ 0.24 | $ 0.24
Contract Operations | Contract operations |  |  |  |
Revenue: |  |  |  |
Revenues | $ 165,450 | $ 151,114 | $ 326,647 | $ 301,098
Costs and expenses: |  |  |  |
Costs of sales (excluding depreciation and amortization expense) | 67,809 | 62,243 | 132,404 | 126,340
Aftermarket Services | Aftermarket services |  |  |  |
Revenue: |  |  |  |
Revenues | 61,420 | 46,868 | 112,263 | 86,769
Costs and expenses: |  |  |  |
Costs of sales (excluding depreciation and amortization expense) | $ 50,793 | $ 39,609 | $ 93,130 | $ 73,341

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