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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Schedule Of Quarterly Financial Data |
|  | Quarter Ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 470,285 |  |  | $ | 460,147 |  |  | $ | 438,042 |  |  | $ | 441,920 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct cost of revenues |  |  | 305,636 |  |  |  | 303,194 |  |  |  | 293,702 |  |  |  | 308,239 |
Selling, general and administrative expenses |  |  | 103,609 |  |  |  | 108,245 |  |  |  | 106,220 |  |  |  | 116,478 |
Special charges |  |  | 5,061 |  |  |  | 1,750 |  |  |  | — |  |  |  | 3,634 |
Acquisition-related contingent consideration |  |  | 1,134 |  |  |  | 206 |  |  |  | 201 |  |  |  | 623 |
Amortization of other intangible assets |  |  | 2,606 |  |  |  | 2,590 |  |  |  | 2,845 |  |  |  | 2,265 |
|  |  | 418,046 |  |  |  | 415,985 |  |  |  | 402,968 |  |  |  | 431,239 |
Operating income |  |  | 52,239 |  |  |  | 44,162 |  |  |  | 35,074 |  |  |  | 10,681 |
Interest income and other |  |  | 2,557 |  |  |  | 4,125 |  |  |  | 3,213 |  |  |  | 571 |
Interest expense |  |  | (6,229 | ) |  |  | (6,303 | ) |  |  | (6,304 | ) |  |  | (5,983 | )
Income before income tax provision |  |  | 48,567 |  |  |  | 41,984 |  |  |  | 31,983 |  |  |  | 5,269 |
Income tax provision |  |  | 18,386 |  |  |  | 15,437 |  |  |  | 10,292 |  |  |  | (1,832 | )
Net income |  | $ | 30,181 |  |  | $ | 26,547 |  |  | $ | 21,691 |  |  | $ | 7,101 |
Earnings per common share — basic |  | $ | 0.75 |  |  | $ | 0.65 |  |  | $ | 0.53 |  |  | $ | 0.17 |
Earnings per common share — diluted |  | $ | 0.73 |  |  | $ | 0.64 |  |  | $ | 0.52 |  |  | $ | 0.17 |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 40,506 |  |  |  | 40,820 |  |  |  | 41,239 |  |  |  | 41,201 |
Diluted |  |  | 41,148 |  |  |  | 41,599 |  |  |  | 42,065 |  |  |  | 42,018 |
|  | Quarter Ended |
|  | March 31 |  |  | June 30 |  |  | September 30 |  |  | December 31 |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 432,338 |  |  | $ | 449,137 |  |  | $ | 455,470 |  |  | $ | 442,204 |
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct cost of revenues |  |  | 279,030 |  |  |  | 291,469 |  |  |  | 301,609 |  |  |  | 299,336 |
Selling, general and administrative expenses |  |  | 102,214 |  |  |  | 109,045 |  |  |  | 105,058 |  |  |  | 116,351 |
Acquisition-related contingent consideration |  |  | 234 |  |  |  | (1,538 | ) |  |  | 159 |  |  |  | (55 | )
Amortization of other intangible assets |  |  | 3,012 |  |  |  | 3,007 |  |  |  | 2,900 |  |  |  | 2,807 |
|  |  | 384,490 |  |  |  | 401,983 |  |  |  | 409,726 |  |  |  | 418,439 |
Operating income |  |  | 47,848 |  |  |  | 47,154 |  |  |  | 45,744 |  |  |  | 23,765 |
Interest income and other |  |  | (137 | ) |  |  | 950 |  |  |  | 2,027 |  |  |  | 392 |
Interest expense |  |  | (12,368 | ) |  |  | (12,473 | ) |  |  | (11,696 | ) |  |  | (6,231 | )
Loss on early extinguishment of debt |  |  | — |  |  |  | — |  |  |  | (19,589 | ) |  |  | — |
Income before income tax provision |  |  | 35,343 |  |  |  | 35,631 |  |  |  | 16,486 |  |  |  | 17,926 |
Income tax provision |  |  | 11,657 |  |  |  | 13,922 |  |  |  | 6,177 |  |  |  | 7,577 |
Net income |  | $ | 23,686 |  |  | $ | 21,709 |  |  | $ | 10,309 |  |  | $ | 10,349 |
Earnings per common share — basic |  | $ | 0.59 |  |  | $ | 0.53 |  |  | $ | 0.25 |  |  | $ | 0.25 |
Earnings per common share — diluted |  | $ | 0.57 |  |  | $ | 0.52 |  |  | $ | 0.25 |  |  | $ | 0.25 |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 40,384 |  |  |  | 40,792 |  |  |  | 41,094 |  |  |  | 41,078 |
Diluted |  |  | 41,324 |  |  |  | 41,696 |  |  |  | 41,982 |  |  |  | 41,879 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
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