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Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Revenue | $ 799,832 | $ 750,422 |  | $ 719,483
Operating expenses | 697,726 | 652,391 | [1] | 629,804
Gross margin | 102,106 | 98,031 |  | 89,679
Corporate general and administrative expenses | 36,319 | 32,527 | [1] | 34,183
Operating income (loss) | 65,787 | 65,504 |  | 55,496
Other income (expense): |  |  |  |
Interest expense | (6,593) | (8,902) |  | (13,124)
Gain on sale of operations, net | 855 | 84 |  | 1,303
Other income, net | 6,957 | 1,146 | [1] | 6,893
Total other income (expense), net | 1,219 | (7,672) |  | (4,928)
Income from continuing operations before income tax expense | 67,006 | 57,832 |  | 50,568
Income tax expense | 26,399 | 22,829 |  | 20,154
Income (loss) from continuing operations | 40,607 | 35,003 |  | 30,414
Loss from operations of discontinued operations, net of tax | (542) | (2,323) |  | (754)
Gain on disposal of discontinued operations, net of tax |  | 1,427 |  | 99
Net income (loss) | $ 40,065 | $ 34,107 |  | $ 29,759
Basic: |  |  |  |
Continuing operations | $ 0.78 | $ 0.70 |  | $ 0.63
Discontinued operations | (0.01) | (0.01) |  | (0.01)
Net income | 0.77 | 0.69 |  | 0.62
Diluted: |  |  |  |
Continuing operations | 0.76 | 0.66 |  | 0.59
Discontinued operations | (0.01) | (0.01) |  | (0.01)
Net income | $ 0.75 | $ 0.65 |  | $ 0.58
Basic weighted average common shares outstanding | 52,321 | 50,280 |  | 48,343
Diluted weighted average common shares outstanding | 53,513 | 52,693 |  | 51,487
Comprehensive income: |  |  |  |
Net income | $ 40,065 | $ 34,107 |  | $ 29,759
Other comprehensive income: |  |  |  |
Net unrealized loss on available-for-sale securities, net of income tax benefit of $16, $77 and $74 | (23) | (114) |  | (117)
Net unrealized gain on interest rate swaps, net of income tax expense of $107, $135 and $121 | 182 | 230 |  | 206
Foreign currency translation | (30) | (54) |  | (59)
Total other comprehensive income | 129 | 62 |  | 30
Total comprehensive income | $ 40,194 | $ 34,169 |  | $ 29,789
[1] | “Operating expenses” under the Financial Services and Benefits and Insurance Services practice groups include a reduction of $0.9 million and $0.6 million related to a state payroll tax incentive associated with an office relocation. “Corporate general and administrative expenses” include a reduction of less than $0.1 million related to the office relocation as discussed above. The reductions was recorded in “Other (expense) income, net” in 2015 but was reclassified to “Operating expenses” and “Corporate general and administrative expenses” to align the incentives with the expenses associated with the office relocation. The reclassification had no impact on “Income from continuing operations” or diluted earnings per share from continuing operations.

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831223 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 + Details
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