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v3.10.0.1

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |
Net service revenues | $ 5,800,271 | $ 5,266,789 | $ 5,250,399
Direct costs of services, consisting of payroll, payroll taxes, benefit costs and reimbursable expenses | 3,390,257 | 3,102,977 | 3,089,723
Gross margin | 2,410,014 | 2,163,812 | 2,160,676
Selling, general and administrative expenses | 1,821,089 | 1,646,532 | 1,606,217
Amortization of intangible assets | 1,705 | 1,563 | 1,237
Interest income, net | (4,382) | (1,799) | (888)
Income before income taxes | 591,602 | 517,516 | 554,110
Provision for income taxes | 157,314 | 226,932 | 210,721
Net income | $ 434,288 | $ 290,584 | $ 343,389
Net income per share : |  |  |
Basic (usd per share) | $ 3.60 | $ 2.34 | $ 2.68
Diluted (usd per share) | $ 3.57 | $ 2.33 | $ 2.67
Shares: |  |  |
Basic (in shares) | 120,513 | 124,152 | 127,991
Diluted (in shares) | 121,602 | 124,892 | 128,766
Cash dividends declared per share (usd per share) | $ 1.12 | $ 0.96 | $ 0.88

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