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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS |  |  |  |
REVENUE | $ 594,536 | $ 480,851 | $ 1,594,520 | $ 1,326,850
COST OF SERVICES | 466,668 | 379,993 | 1,266,416 | 1,054,300
Gross profit | 127,868 | 100,858 | 328,104 | 272,550
SELLING, GENERAL AND ADMINISTRATIVE EXPENSES | 75,297 | 66,707 | 216,528 | 196,553
GOODWILL IMPAIRMENT |  |  |  | 1,105
GAIN ON SALE OF ASSETS | (219) | (184) | (630) | (464)
Operating income | 52,790 | 34,335 | 112,206 | 75,356
OTHER INCOME (EXPENSE): |  |  |  |
Interest income | 25 | 16 | 53 | 55
Interest expense | (1,152) | (961) | (2,601) | (2,392)
Changes in the fair value of contingent earn-out obligations | 434 | 2,469 | 493 | 1,845
Other | 39 | 10 | 4,062 | 57
Other income (expense) | (654) | 1,534 | 2,007 | (435)
INCOME BEFORE INCOME TAXES | 52,136 | 35,869 | 114,213 | 74,921
PROVISION FOR INCOME TAXES | 13,595 | 13,585 | 26,466 | 27,188
NET INCOME | $ 38,541 | $ 22,284 | $ 87,747 | $ 47,733
INCOME PER SHARE: |  |  |  |
Basic (in shares) | $ 1.03 | $ 0.60 | $ 2.36 | $ 1.28
Diluted (in shares) | $ 1.02 | $ 0.59 | $ 2.33 | $ 1.27
SHARES USED IN COMPUTING INCOME PER SHARE: |  |  |  |
Basic (in shares) | 37,294 | 37,232 | 37,236 | 37,259
Diluted (in shares) | 37,667 | 37,626 | 37,634 | 37,684
DIVIDENDS PER SHARE (in dollars per share) | $ 0.085 | $ 0.075 | $ 0.240 | $ 0.220

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration