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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues: |  |  |
New vehicles | $ 5,295,051 | $ 5,234,505 | $ 5,265,401
Used vehicles | 2,622,053 | 2,533,122 | 2,512,024
Wholesale vehicles | 171,064 | 211,048 | 155,339
Total vehicles | 8,088,168 | 7,978,675 | 7,932,764
Parts, service and collision repair | 1,416,010 | 1,409,819 | 1,364,947
Finance, insurance and other, net | 363,030 | 343,285 | 326,588
Total revenues | 9,867,208 | 9,731,779 | 9,624,299
Cost of Sales: |  |  |
New vehicles | (5,030,125) | (4,973,911) | (4,997,472)
Used vehicles | (2,467,150) | (2,374,537) | (2,349,982)
Wholesale vehicles | (179,778) | (218,364) | (162,707)
Total vehicles | (7,677,053) | (7,566,812) | (7,510,161)
Parts, service and collision repair | (732,479) | (735,693) | (699,526)
Total cost of sales | (8,409,532) | (8,302,505) | (8,209,687)
Gross profit | 1,457,676 | 1,429,274 | 1,414,612
Selling, general and administrative expenses | (1,147,773) | (1,110,856) | (1,110,565)
Impairment charges | (9,394) | (8,063) | (17,955)
Depreciation and amortization | (88,944) | (77,446) | (68,799)
Operating income (loss) | 211,565 | 232,909 | 217,293
Other income (expense): |  |  |
Interest expense, floor plan | (36,395) | (27,716) | (21,326)
Interest expense, other, net | (52,524) | (50,106) | (50,910)
Other income (expense), net | (14,522) | 125 | 99
Total other income (expense) | (103,441) | (77,697) | (72,137)
Income (loss) from continuing operations before taxes | 108,124 | 155,212 | 145,156
Provision for income taxes for continuing operations - benefit (expense) | (13,971) | (60,696) | (57,065)
Income (loss) from continuing operations | 94,153 | 94,516 | 88,091
Discontinued operations: |  |  |
Income (loss) from discontinued operations before taxes | (1,942) | (2,121) | (2,883)
Provision for income taxes for discontinued operations - benefit (expense) | 772 | 798 | 1,103
Income (loss) from discontinued operations | (1,170) | (1,323) | (1,780)
Net income (loss) | $ 92,983 | $ 93,193 | $ 86,311
Basic earnings (loss) per common share: |  |  |
Earnings (loss) per share from continuing operations | $ 2.14 | $ 2.07 | $ 1.74
Earnings (loss) per share from discontinued operations | (0.03) | (0.03) | (0.03)
Earnings (loss) per common share | $ 2.11 | $ 2.04 | $ 1.71
Weighted average common shares outstanding | 43,997 | 45,637 | 50,489
Diluted earnings (loss) per common share: |  |  |
Earnings (loss) per share from continuing operations | $ 2.12 | $ 2.06 | $ 1.73
Earnings (loss) per share from discontinued operations | (0.03) | (0.03) | (0.03)
Earnings (loss) per common share | $ 2.09 | $ 2.03 | $ 1.70
Weighted average common shares outstanding | 44,358 | 45,948 | 50,883
Dividends declared per common share | $ 0.20 | $ 0.20 | $ 0.11

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