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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Income Statement [Abstract] |  |  |  |
Net revenues | $ 1,880 | $ 1,904 | $ 5,644 | $ 5,552
Operating costs and expenses: |  |  |  |
Cost of services | 1,162 | 1,178 | 3,507 | 3,453
Selling, general and administrative | 402 | 446 | 1,250 | 1,301
Amortization expense | 20 | 24 | 61 | 71
Gain on contribution of business to joint venture | (334) | 0 | (334) | 0
Other operating (income) expense, net | (1) | 0 | 0 | 1
Total operating costs and expenses | 1,249 | 1,648 | 4,484 | 4,826
Operating income | 631 | 256 | 1,160 | 726
Other income (expense): |  |  |  |
Interest expense, net | (35) | (41) | (117) | (122)
Other (expense) income, net | (4) | (1) | (146) | 3
Total non-operating expenses, net | (39) | (42) | (263) | (119)
Income before income taxes and equity in earnings of equity method investees | 592 | 214 | 897 | 607
Income tax expense | (239) | (82) | (359) | (234)
Equity in earnings of equity method investees, net of taxes | 1 | 7 | 15 | 19
Net income | 354 | 139 | 553 | 392
Less: Net income attributable to noncontrolling interests | 12 | 10 | 32 | 26
Net income attributable to Quest Diagnostics | $ 342 | $ 129 | $ 521 | $ 366
Earnings per share attributable to Quest Diagnostics’ common stockholders: |  |  |  |
Basic (per share) | $ 2.37 | $ 0.89 | $ 3.61 | $ 2.52
Diluted (per share) | $ 2.35 | $ 0.88 | $ 3.58 | $ 2.51
Weighted average common shares outstanding: |  |  |  |
Basic (in Shares) | 144 | 145 | 144 | 144
Diluted (in Shares) | 145 | 145 | 145 | 145
Dividends per common share | $ 0.38 | $ 0.33 | $ 1.14 | $ 0.99

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