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Acquisitions (Acquisitions Costs, by Acquisition) (Details) Share data in Millions, unless otherwise specified |  | 1 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2013 CyberCoders [Member] USD ($) | Dec. 31, 2013 CyberCoders [Member] USD ($) | Dec. 05, 2013 CyberCoders [Member] USD ($) | May 15, 2012 Apex Systems USD ($) | Dec. 31, 2012 Apex Systems USD ($) | Sep. 30, 2012 Apex Systems USD ($) | Jul. 31, 2011 HCP USD ($) | Dec. 31, 2011 HCP USD ($) | Feb. 28, 2011 Valesta USD ($) | Feb. 28, 2011 Valesta EUR (€) | Dec. 31, 2011 Valesta USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Effective Date of Acquisition |  | Dec. 05, 2013 |  |  | May 15, 2012 |  |  | Jul. 31, 2011 |  | Feb. 28, 2011 | Feb. 28, 2011 |
Name of Acquired Entity |  | CyberCoders Holdings, Inc |  |  | Apex Systems, Inc. |  |  | HealthCare Partners, Inc. ("HCP") |  | Warphi N.V. and its subsidiaries (collectively, "Valesta") | Warphi N.V. and its subsidiaries (collectively, "Valesta") |
Description of Acquired Entity |  | a privately-owned provider of permanent placement services headquartered in Irvine, California. |  |  | a privately-owned provider of information technology staffing headquartered in Richmond, Virginia. |  |  | a privately-owned provider of physician staffing headquartered in Atlanta, Georgia |  | a privately-owned provider of specialized clinical research staffing headquartered in Belgium | a privately-owned provider of specialized clinical research staffing headquartered in Belgium |
Reason for Business Combination |  | The primary reason for the acquisition was to expand the Company's permanent placement services. |  |  | The primary reason for the acquisition was to expand the Company's information technology staffing services. |  |  | The primary reasons for the acquisition were to expand the Physician segment business operations geographic coverage and to leverage the Company’s infrastructure. |  | The primary reasons for the acquisition were to expand the Life Sciences business operations and to leverage the Company’s infrastructure | The primary reasons for the acquisition were to expand the Life Sciences business operations and to leverage the Company’s infrastructure |
Purchase price |  |  |  | $ 98,600,000 | $ 610,800,000 |  |  | $ 19,100,000 |  | $ 23,700,000 |  |
Cost of acquired entity, cash paid |  |  |  | 93,600,000 | 385,000,000 |  | 300,000 | 15,700,000 |  | 16,800,000 |  |
Shares of Company's common stock issued (in shares) |  |  |  |  | 14.3 |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  | 1,500,000 |  |  | 9,800,000 |  |  | 57,000 |  |  | 400,000
Revenues of acquiree included in statement of operations |  | 3,600,000 |  |  |  |  |  |  |  |  |  |
Net loss of acquiree included in statement of operations |  | (100,000) |  |  |  |  |  |  |  |  |  |
Potential future earn-out consideration |  |  |  | 5,000,000 |  |  |  | 3,400,000 |  | 6,900,000 |  |
Maximum earn-out capped | $ 16,000,000 |  |  | $ 11,000,000 |  |  |  | $ 3,700,000 |  |  | € 5,000,000 |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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