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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues | $ 3,503 | $ 3,275 | $ 3,060
Insurance costs | 2,610 | 2,466 | 2,414
Cost of providing services (exclusive of depreciation and amortization of intangible assets) | 229 | 213 | 190
Sales and marketing | 182 | 187 | 174
General and administrative | 142 | 114 | 92
Systems development and programming | 49 | 45 | 31
Depreciation and amortization of intangible assets | 40 | 33 | 35
Total costs and operating expenses | 3,252 | 3,058 | 2,936
Operating income | 251 | 217 | 124
Other income (expense): |  |  |
Interest expense, bank fees and other | (22) | (20) | (20)
Interest income | 12 | 3 | 0
Income before provision for income taxes | 241 | 200 | 104
Income tax expense | 49 | 22 | 43
Net income | 192 | 178 | 61
Other comprehensive income, net of tax | $ 0 | 0 | 1
Comprehensive income |  | $ 178 | $ 62
Net income per share: |  |  |
Basic (in dollars per share) | $ 2.72 | $ 2.57 | $ 0.88
Diluted (in dollars per share) | $ 2.65 | $ 2.49 | $ 0.85
Weighted average shares: |  |  |
Basic (in shares) | 70,385,639 | 69,175,377 | 70,159,696
Diluted (in shares) | 72,300,663 | 71,385,280 | 71,972,486
Professional service revenues |  |  |
Revenues | $ 487 | $ 458 | $ 447
Insurance service revenues |  |  |
Revenues | $ 3,016 | $ 2,817 | $ 2,613

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