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13. QUARTERLY RESULTS OF OPERATIONS (unaudited) (Details-Statements of Operations) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net revenue | $ 235,552 | $ 227,607 | $ 230,014 | $ 229,013 | $ 224,939 | $ 224,643 | $ 218,565 | $ 216,388 | $ 922,186 | $ 884,535 | $ 809,628
Total operating expenses | 217,252 | 216,765 | 215,853 | 222,266 | 209,971 | 212,192 | 210,487 | 213,405 | 872,136 | 846,055 | 770,511
Total other expenses | 9,889 | 9,328 | 8,009 | 9,993 | 10,641 | 11,578 | 5,717 | 7,875 | 10,111 | 16,277 | 15,545
Equity in earnings of joint ventures | (5,182) | (3,450) | (2,994) | (1,928) | (1,638) | (2,576) | (3,274) | (2,279) | (13,554) | (9,767) | (8,927)
Benefit from (provision for) income taxes | (20,133) | (1,112) | (3,523) | 458 | (1,901) | (1,458) | (2,253) | 1,180 | (24,310) | (4,432) | (6,007)
Net (loss) income | (6,540) | 3,852 | 5,623 | (860) | 4,064 | 1,991 | 3,382 | (1,433) | 2,075 | 8,004 | 8,638
Net income (loss) attributable to noncontrolling intersts | 736 | 623 | 313 | 350 | 383 | 344 | (243) | 290 | 2,022 | 774 | 929
Net (loss) income attributable to Radnet, Inc. common stockholders | $ (7,276) | $ 3,229 | $ 5,310 | $ (1,210) | $ 3,681 | $ 1,647 | $ 3,625 | $ (1,723) | $ 53 | $ 7,230 | $ 7,709
Basic net (loss) income attributable to Radnet, Inc. common stockholders (loss) earnings per share: | $ (0.15) | $ 0.07 | $ 0.11 | $ (0.03) | $ 0.08 | $ 0.04 | $ 0.08 | $ (0.04) | $ 0.00 | $ 0.16 | $ 0.18
Diluted net (loss) income attributable to Radnet, Inc. common stockholders (loss) earnings per share: | $ (0.15) | $ 0.07 | $ 0.11 | $ (0.03) | $ 0.08 | $ 0.04 | $ 0.08 | $ (0.04) | $ 0.00 | $ 0.15 | $ 0.17
Weighted average shares outstanding - basic | 47,237 | 46,954 | 46,756 | 46,560 | 45,967 | 45,869 | 46,559 | 46,581 | 46,880,775 | 46,244,188 | 43,805,794
Weighted average shares outstanding - Diluted (in shares) | 47,886 | 47,578 | 47,196 | 46,560 | 46,389 | 46,334 | 46,882 | 46,581 | 47,401,921 | 46,655,032 | 45,171,372

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