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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 |  |  |
Customer services | $ 1,673,957 | $ 1,573,477 | $ 1,485,305
COSTS AND EXPENSES |  |  |
Cost of services provided | 819,943 | 772,348 | 735,976
Depreciation and amortization | 56,580 | 50,902 | 44,522
Sales, general and administrative | 503,433 | 490,528 | 463,742
Gain on sales of assets, net | (242) | (777) | (1,953)
Interest income | (259) | (160) | (160)
TOTAL COSTS AND EXPENSES | 1,379,455 | 1,312,841 | 1,242,127
INCOME BEFORE INCOME TAXES | 294,502 | 260,636 | 243,178
PROVISION FOR INCOME TAXES |  |  |
Current | 96,742 | 96,515 | 87,536
Deferred | 18,636 | (3,248) | 3,493
TOTAL PROVISION FOR INCOME TAXES | 115,378 | 93,267 | 91,029
NET INCOME | $ 179,124 | $ 167,369 | $ 152,149
Income per share—Basic (in dollars per share) | $ 0.82 | $ 0.77 | $ 0.70
Income per share—Diluted (in dollars per share) | $ 0.82 | $ 0.77 | $ 0.70
Weighted average shares outstanding - basic (in shares) | 217,988 | 218,244 | 218,583
Weighted average shares outstanding - diluted (in shares) | 217,988 | 218,244 | 218,583
DIVIDENDS PAID PER SHARE | $ 0.56 | $ 0.50 | $ 0.42

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