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Acquisitions Aquisitions (Tables) | 9 Months Ended
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Sep. 30, 2015
Acquisitions [Abstract] |
Business Acquisition, Pro Forma Information [Table Text Block] | The pro forma financial information is not necessarily indicative of the operating results that would have occurred if the acquisitions had been consummated as of the date indicated, nor are they necessarily indicative of future operating results.
|  | Nine months ended September 30,
|  | 2015 |  | 2014
Revenues |  | $ | 1,601,437 |  |  | $ | 1,456,081 |
Income from continuing operations |  | $ | 59,986 |  |  | $ | 45,238 |
Net income |  | $ | 86,049 |  |  | $ | 47,980 |
Basic earnings per share: |  |  |  |
Income from continuing operations |  | $ | 1.14 |  |  | $ | 0.83 |
Net income |  | $ | 1.64 |  |  | $ | 0.88 |
Diluted earnings per share: |  |  |  |
Income from continuing operations |  | $ | 1.13 |  |  | $ | 0.81 |
Net income |  | $ | 1.62 |  |  | $ | 0.86 |
Weighted average number of shares outstanding |  | 52,508 |  |  | 54,750 |
Weighted average number of shares and dilutive shares outstanding |  | 53,213 |  |  | 55,629 |
ScheduleOfPurchasePriceAllocationTableTextBlock [Table Text Block] | The following table summarizes (in thousands) the purchase price allocations for the acquisitions of Creative Circle and LabResource:
| Creative Circle |  | LabResource
Cash | $ | 4,840 |  |  | $ | 187 |
Accounts receivable | 34,386 |  |  | 1,643 |
Prepaid expenses and other current assets | 3,865 |  |  | — |
Property and equipment | 5,077 |  |  | 12 |
Goodwill | 358,460 |  |  | 6,104 |
Identifiable intangible assets | 194,500 |  |  | 7,528 |
Other | 651 |  |  | — |
Total assets acquired | $ | 601,779 |  |  | $ | 15,474 |
Current liabilities | $ | 12,072 |  |  | $ | 1,482 |
Other | — |  |  | 1,882 |
Total liabilities assumed | 12,072 |  |  | 3,364 |
Total purchase price | $ | 589,707 |  |  | $ | 12,110 |
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] | The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisitions of Creative Circle and LabResource:
|  |  | Identifiable Intangible Asset Value
| Useful life |  | Creative Circle |  | LabResource
Contractor relationships | 4 years |  | $ | 29,500 |  |  | $ | 947 |
Customer relationships | 10 years |  | 90,700 |  |  | 5,421 |
Non-compete agreements | 2 - 6 years |  | 7,300 |  |  | 20 |
Favorable contracts | 5 years |  | 900 |  |  | — |
Trademarks | indefinite |  | 66,100 |  |  | 1,140 |
Total identifiable intangible assets acquired |  | $ | 194,500 |  |  | $ | 7,528 |

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- Definition Tabular disclosure of all the fair values of the purchase price and assets and liabilities acquired in a business combination + References No definition available. + Details
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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Tabular disclosure of the amounts recognized as of the acquisition date for each major class of assets acquired and liabilities assumed. May include but not limited to the following: (a) acquired receivables; (b) contingencies recognized at the acquisition date; and (c) the fair value of noncontrolling interests in the acquiree. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=56956791&loc=d3e4845-128472 + Details
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