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Acquisitions (Tables) | 12 Months Ended
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Dec. 31, 2012
Business Combinations [Abstract] |
Schedule of Purchase Price Allocation | The following tables summarize (in thousands) the purchase price allocations for the acquisitions of Apex, which is subject to finalization during the measurement period and HCP and Valesta:
| 2012 Acquisition |  | 2011 Acquisitions
| Apex |  | HCP |  | Valesta |  | Total
Current assets | $ | 169,844 |  |  | $ | 3,950 |  |  | $ | 6,332 |  |  | $ | 10,282 |
Property and equipment | 902 |  |  | 123 |  |  | 299 |  |  | 422 |
Goodwill | 266,788 |  |  | 14,398 |  |  | 17,911 |  |  | 32,309 |
Identifiable intangible assets | 251,555 |  |  | 1,784 |  |  | 5,679 |  |  | 7,463 |
Other | 494 |  |  | 13 |  |  | 26 |  |  | 39 |
Total assets acquired | $ | 689,583 |  |  | $ | 20,268 |  |  | $ | 30,247 |  |  | $ | 50,515 |
Current liabilities | $ | 77,905 |  |  | $ | 1,070 |  |  | $ | 4,774 |  |  | $ | 5,844 |
Other | 850 |  |  | 49 |  |  | 1,814 |  |  | 1,863 |
Total liabilities assumed | 78,755 |  |  | 1,119 |  |  | 6,588 |  |  | 7,707 |
Total purchase price | $ | 610,828 |  |  | $ | 19,149 |  |  | $ | 23,659 |  |  | $ | 42,808 |
Schedule of Intangible Assets Acquired as Part of Business Combinations | The following table summarizes (in thousands) the allocation of the purchase price among the identifiable intangible assets for the acquisition of Apex, HCP and Valesta:
|  |  | Identifiable Intangible Asset Value
|  |  | 2012 Acquisition |  | 2011 Acquisitions
| Useful life |  | Apex |  | HCP |  | Valesta |  | Total
Contractor relations | 2 – 5 years |  | $ | 10,589 |  |  | $ | 814 |  |  | $ | 266 |  |  | $ | 1,080 |
Customer relations | 2 – 10 years |  | 92,147 |  |  | 950 |  |  | 2,395 |  |  | 3,345 |
Non-compete agreements | 2 – 7 years |  | 2,076 |  |  | 20 |  |  | 440 |  |  | 460 |
Trademarks | indefinite |  | 146,743 |  |  | — |  |  | 2,578 |  |  | 2,578 |
|  |  | $ | 251,555 |  |  | $ | 1,784 |  |  | $ | 5,679 |  |  | $ | 7,463 |
Schedule of Pro Forma Consolidated Results of Operations | The pro forma financial information is not necessarily indicative of the operating results that would have occurred if the acquisition had been consummated as of the date indicated, nor are they necessarily indicative of future operating results.
| 2012 |  | 2011
| (unaudited)
Revenues | $ | 1,521,982 |  |  | $ | 1,316,165 |
Operating income | $ | 121,565 |  |  | $ | 68,608 |
Net income | $ | 55,615 |  |  | $ | 26,109 |
Basic earnings per share | $ | 1.07 |  |  | $ | 0.51 |
Diluted earnings per share | $ | 1.05 |  |  | $ | 0.50 |
Weighted average number of shares outstanding | 52,103 |  |  | 51,180 |
Weighted average number of shares and dilutive shares outstanding | 53,190 |  |  | 52,062 |

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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=7659399&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 54 -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 55 -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. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 68 -Subparagraph r(2, 3) -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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- Definition Tabular disclosure of all of the fair values of the purchase price and assets and liabilities acquired in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + 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=6910749&loc=d3e4845-128472 + Details
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