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Segment Reporting (Segment Reporting Information) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) segment | Jun. 30, 2014 USD ($)
Revenues: |  |  |  |
Revenues | $ 485,323 | $ 434,424 | $ 915,368 | $ 841,275
Revenue as Percentage of Consolidated Revenue | 100.00% | 100.00% | 100.00% | 100.00%
Gross Profit: |  |  |  |
Total Gross Profit | $ 158,534 | $ 141,905 | $ 294,409 | $ 270,060
Operating Income (Loss): |  |  |  |
Total Operating Income | 32,710 | 36,769 | 57,781 | 63,277
Amortization of Intangible Assets | 6,957 | 5,522 | $ 11,826 | 11,060
Reportable segments (in number of segments) | segment |  |  | 2 |
Corporate Segment [Member] |  |  |  |
Operating Income (Loss): |  |  |  |
Total Operating Income | (20,348) | (13,967) | $ (33,933) | (25,848)
Amortization of Intangible Assets | 0 | 0 | 0 | 8
Apex |  |  |  |
Revenues: |  |  |  |
Revenues | 338,704 | 297,893 | 632,997 | 576,301
Gross Profit: |  |  |  |
Total Gross Profit | 97,652 | 84,677 | 177,295 | 160,183
Operating Income (Loss): |  |  |  |
Total Operating Income | 34,228 | 31,708 | 57,139 | 54,492
Amortization of Intangible Assets | 5,384 | 4,089 | 8,906 | 8,178
Oxford |  |  |  |
Revenues: |  |  |  |
Revenues | 146,619 | 136,531 | 282,371 | 264,974
Gross Profit: |  |  |  |
Total Gross Profit | 60,882 | 57,228 | 117,114 | 109,877
Operating Income (Loss): |  |  |  |
Total Operating Income | 18,830 | 19,028 | 34,575 | 34,633
Amortization of Intangible Assets | 1,573 | 1,433 | 2,920 | 2,874
Physician Segment [Member] |  |  |  |
Operating Income (Loss): |  |  |  |
Total Operating Income | 405 |  | 766 |
Domestic [Member] |  |  |  |
Revenues: |  |  |  |
Revenues | $ 462,989 | $ 414,624 | $ 873,745 | $ 801,577
Revenue as Percentage of Consolidated Revenue | 95.40% | 95.40% | 95.50% | 95.30%
Assignment [Member] |  |  |  |
Revenues: |  |  |  |
Revenues | $ 456,592 | $ 412,953 | $ 862,733 | $ 800,810
Revenue as Percentage of Consolidated Revenue | 94.10% | 95.10% | 94.20% | 95.20%
Direct hire and conversion fees [Member] |  |  |  |
Revenues: |  |  |  |
Revenues | $ 28,731 | $ 21,471 | $ 52,635 | $ 40,465
Revenue as Percentage of Consolidated Revenue | 5.90% | 4.90% | 5.80% | 4.80%

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