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Segment Reporting (Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 segment | Jun. 30, 2013
Segment Reporting [Abstract] |  |  |  |
Reportable segments (in number of segments) |  |  | 4 |
Revenues: |  |  |  |
Revenues | $ 468,618 | $ 407,864 | $ 907,892 | $ 786,908
Gross Profit: |  |  |  |
Total Gross Profit | 152,727 | 121,332 | 290,315 | 231,443
Operating Income (Loss): |  |  |  |
Total Operating Income | 38,648 | 31,775 | 65,930 | 54,630
Amortization of Intangible Assets | 6,156 | 5,275 | 12,328 | 10,654
Apex |  |  |  |
Revenues: |  |  |  |
Revenues | 297,893 | 262,347 | 576,301 | 502,112
Gross Profit: |  |  |  |
Total Gross Profit | 84,677 | 72,912 | 160,183 | 136,893
Operating Income (Loss): |  |  |  |
Total Operating Income | 31,708 | 24,637 | 54,492 | 41,866
Amortization of Intangible Assets | 4,089 | 4,881 | 8,178 | 9,762
Oxford |  |  |  |
Revenues: |  |  |  |
Revenues | 126,004 | 109,153 | 243,504 | 211,841
Gross Profit: |  |  |  |
Total Gross Profit | 53,611 | 37,122 | 102,637 | 71,937
Operating Income (Loss): |  |  |  |
Total Operating Income | 17,828 | 15,944 | 32,112 | 29,610
Amortization of Intangible Assets | 1,362 | 96 | 2,732 | 203
Physician |  |  |  |
Revenues: |  |  |  |
Revenues | 33,657 | 26,466 | 65,448 | 52,768
Gross Profit: |  |  |  |
Total Gross Profit | 10,298 | 7,640 | 19,136 | 15,123
Operating Income (Loss): |  |  |  |
Total Operating Income | 2,455 | 2,213 | 3,714 | 4,639
Amortization of Intangible Assets | 634 | 176 | 1,268 | 352
Life Sciences Europe |  |  |  |
Revenues: |  |  |  |
Revenues | 11,064 | 9,898 | 22,639 | 20,187
Gross Profit: |  |  |  |
Total Gross Profit | 4,141 | 3,658 | 8,359 | 7,490
Operating Income (Loss): |  |  |  |
Total Operating Income | 1,028 | 448 | 2,227 | 981
Amortization of Intangible Assets | 71 | 102 | 142 | 262
Corporate Segment |  |  |  |
Operating Income (Loss): |  |  |  |
Total Operating Income | (14,371) | (11,467) | (26,615) | (22,466)
Amortization of Intangible Assets | $ 0 | $ 20 | $ 8 | $ 75

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