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Acquisitions (Schedule of Purchase Price Allocation) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | May 15, 2012 Apex Systems | Jul. 31, 2011 HCP | Feb. 28, 2011 Valesta
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Current assets | $ 10,282 | $ 169,803 | $ 3,950 | $ 6,332
Property and equipment | 422 | 902 | 123 | 299
Goodwill | 31,486 | 266,716 | 14,398 | 17,088
Identifiable intangible assets | 7,463 | 251,555 | 1,784 | 5,679
Other | 39 | 494 | 13 | 26
Total assets acquired | 49,692 | 689,470 | 20,268 | 29,424
Current liabilities | 5,844 | 77,793 | 1,070 | 4,774
Other | 1,040 | 850 | 49 | 991
Total liabilities assumed | 6,884 | 78,643 | 1,119 | 5,765
Total purchase price | $ 42,808 | $ 610,827 | $ 19,149 | $ 23,659

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