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Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 910,820 | $ 868,951 | $ 842,944 | $ 835,597 | $ 830,770 | $ 828,006 | $ 771,759 | $ 752,624 | $ 3,458,312 | $ 3,183,159 | $ 2,779,996
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits | 617,455 | 586,476 | 561,418 | 572,385 | 532,952 | 521,832 | 484,625 | 491,811 | 2,337,734 | 2,031,220 | 1,753,505
Practice supplies and other operating expenses | 32,353 | 29,497 | 30,872 | 27,796 | 32,737 | 31,641 | 26,992 | 27,046 | 120,518 | 118,416 | 98,480
General and administrative expenses | 108,895 | 101,430 | 103,015 | 103,765 | 97,049 | 93,457 | 92,116 | 89,950 | 417,105 | 372,572 | 305,915
Depreciation and amortization | 26,414 | 25,116 | 25,735 | 25,614 | 25,254 | 24,185 | 20,241 | 19,584 | 102,879 | 89,264 | 64,228
Total operating expenses | 785,117 | 742,519 | 721,040 | 729,560 | 687,992 | 671,115 | 623,974 | 628,391 | 2,978,236 | 2,611,472 | 2,222,128
Income from operations | 125,703 | 126,432 | 121,904 | 106,037 | 142,778 | 156,891 | 147,785 | 124,233 | 480,076 | 571,687 | 557,868
Investment and other income | 2,777 | 235 | 365 | 576 | 770 | 221 | 410 | 618 | 3,953 | 2,019 | 1,844
Interest expense | (19,844) | (18,428) | (18,535) | (17,752) | (16,356) | (17,215) | (15,058) | (14,463) | (74,559) | (63,092) | (23,110)
Equity in earnings of unconsolidated affiliates | (294) | (240) | 689 | 797 | 806 | 796 | 789 | 794 | 952 | 3,185 | 3,127
Total non-operating expenses | (17,361) | (18,433) | (17,481) | (16,379) | (14,780) | (16,198) | (13,859) | (13,051) | (69,654) | (57,888) | (18,139)
Income before income taxes | 108,342 | 107,999 | 104,423 | 89,658 | 127,998 | 140,693 | 133,926 | 111,182 | 410,422 | 513,799 | 539,729
Income tax provision | 27,761 | (42,119) | (40,725) | (34,967) | (49,919) | (44,272) | (51,601) | (43,411) | (90,050) | (189,203) | (204,038)
Net income |  |  |  |  | 78,079 | 96,421 | 82,325 | 67,771 | 320,372 | 324,596 | 335,691
Net loss attributable to noncontrolling interests |  |  |  |  |  | 88 | 102 | 128 |  | 318 | 629
Net income attributable to MEDNAX, Inc. | $ 136,103 | $ 65,880 | $ 63,698 | $ 54,691 | $ 78,079 | $ 96,509 | $ 82,427 | $ 67,899 | $ 320,372 | $ 324,914 | $ 336,320
Net income attributable to MEDNAX, Inc.: |  |  |  |  |  |  |  |  |  |  |
Earnings per share, Basic | $ 1.47 | $ 0.71 | $ 0.69 | $ 0.59 | $ 0.84 | $ 1.04 | $ 0.89 | $ 0.74 | $ 3.47 | $ 3.52 | $ 3.61
Earnings per share, Diluted | $ 1.46 | $ 0.71 | $ 0.69 | $ 0.59 | $ 0.84 | $ 1.04 | $ 0.89 | $ 0.73 | $ 3.45 | $ 3.49 | $ 3.58
Weighted average common shares: |  |  |  |  |  |  |  |  |  |  |
Basic | 92,756 | 92,589 | 92,181 | 92,360 | 92,728 | 92,604 | 92,182 | 92,269 | 92,431 | 92,422 | 93,077
Diluted | 93,159 | 92,881 | 92,812 | 93,143 | 93,347 | 93,146 | 92,945 | 93,091 | 92,958 | 93,109 | 93,960

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