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Quarterly Financial Data (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Schedule Of Quarterly Financial Data |
| Quarter Ended
| March 31 |  | June 30 |  | September 30 |  | December 31
2017 |  |  |  |  |  |  |
Revenues | $ | 446,344 |  |  | $ | 444,715 |  |  | $ | 448,962 |  |  | $ | 467,711 |
Operating expenses |  |  |  |  |  |  |
Direct cost of revenues | 309,072 |  |  | 304,071 |  |  | 294,851 |  |  | 307,566 |
Selling, general and administrative expenses | 107,295 |  |  | 107,342 |  |  | 103,909 |  |  | 111,176 |
Special charges | — |  |  | 30,074 |  |  | — |  |  | 10,811 |
Acquisition-related contingent consideration | 395 |  |  | 777 |  |  | 252 |  |  | 867 |
Amortization of other intangible assets | 2,493 |  |  | 2,422 |  |  | 2,882 |  |  | 2,766 |
| 419,255 |  |  | 444,686 |  |  | 401,894 |  |  | 433,186 |
Operating income | 27,089 |  |  | 29 |  |  | 47,068 |  |  | 34,525 |
Interest income and other | 605 |  |  | 1,592 |  |  | 1,103 |  |  | 452 |
Interest expense | (5,801 | ) |  | (6,250 | ) |  | (6,760 | ) |  | (6,547 | )
Income before income tax provision (benefit) | 21,893 |  |  | (4,629 | ) |  | 41,411 |  |  | 28,430 |
Income tax provision (benefit) | 7,877 |  |  | 527 |  |  | 9,197 |  |  | (38,458 | )
Net income | $ | 14,016 |  |  | $ | (5,156 | ) |  | $ | 32,214 |  |  | $ | 66,888 |
Earnings per common share — basic (1) | $ | 0.35 |  |  | $ | (0.13 | ) |  | $ | 0.86 |  |  | $ | 1.81 |
Earnings per common share — diluted (1) | $ | 0.34 |  |  | $ | (0.13 | ) |  | $ | 0.85 |  |  | $ | 1.78 |
Weighted average common shares outstanding |  |  |  |  |  |  |
Basic | 40,527 |  |  | 39,555 |  |  | 37,431 |  |  | 36,906 |
Diluted | 41,245 |  |  | 39,555 |  |  | 37,746 |  |  | 37,643 |
| 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 (1) | $ | 0.75 |  |  | $ | 0.65 |  |  | $ | 0.53 |  |  | $ | 0.17 |
Earnings per common share — diluted (1) | $ | 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 |
(1) | The sum of the quarterly earnings per share amounts may not equal the annual amounts due to changes in the weighted average number of common shares outstanding during each quarterly period.

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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=84173487&loc=d3e1280-108306 + Details
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