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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |
Revenue | $ 269,998 | $ 266,090
Operating expenses | 215,496 | 204,750
Gross margin | 54,502 | 61,340
Corporate general and administrative expenses | 11,680 | 10,028
Operating income | 42,822 | 51,312
Other income (expense): |  |
Interest expense | (1,401) | (1,780)
Gain on sale of operations, net | 497 | 663
Other income (expense), net | 9,260 | (1,229)
Total other income (expense), net | 8,356 | (2,346)
Income from continuing operations before income tax expense | 51,178 | 48,966
Income tax expense | 13,613 | 13,156
Income from continuing operations | 37,565 | 35,810
(Loss) income from discontinued operations, net of tax | (96) | 41
Net income | $ 37,469 | $ 35,851
Earnings per share - basic | $ 0.69 | $ 0.66
Earnings per share - diluted | $ 0.67 | $ 0.64
Basic weighted average shares outstanding | 54,287 | 54,071
Diluted weighted average shares outstanding | 55,915 | 55,924
Comprehensive income: |  |
Net income | $ 37,469 | $ 35,851
Other comprehensive income, net of tax | 81 | 114
Comprehensive income | $ 37,550 | $ 35,965

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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