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Business Segments (Segment Reporting Information) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 segment | Dec. 31, 2012 | Dec. 31, 2011
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 423,598 |  | $ 421,491 | $ 407,864 | $ 379,044 | $ 369,441 |  | $ 363,882 | $ 256,386 | $ 148,277 | $ 1,631,997 |  | $ 1,137,986 |  | $ 515,584 |
Gross profit | 129,753 |  | 127,210 | 121,332 | 110,111 | 112,054 |  | 112,213 | 81,509 | 50,117 | 488,406 |  | 355,893 |  | 177,688 |
Operating Income |  |  |  |  |  |  |  |  |  |  | 123,968 |  | 81,181 |  | 38,633 |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | 21,751 |  | 18,016 |  | 2,346 |
Assets | 1,261,194 | [1] |  |  |  | 1,114,463 | [1] |  |  |  | 1,261,194 | [1] | 1,114,463 | [1] | 427,267 | [1]
Reportable segments (in number of segments) |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |
Apex |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 942,463 |  | 508,743 |  |  |
Gross profit |  |  |  |  |  |  |  |  |  |  | 258,150 |  | 140,669 |  |  |
Operating Income |  |  |  |  |  |  |  |  |  |  | 76,971 |  | 36,416 |  |  |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | 19,524 |  | 15,665 |  |  |
Assets | 656,733 | [1] |  |  |  | 642,594 | [1] |  |  |  | 656,733 | [1] | 642,594 | [1] |  |
Oxford |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 412,189 |  | 363,765 |  | 279,643 |
Gross profit |  |  |  |  |  |  |  |  |  |  | 143,334 |  | 127,895 |  | 99,187 |
Operating Income |  |  |  |  |  |  |  |  |  |  | 58,990 |  | 56,289 |  | 37,676 |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | 965 |  | 437 |  | 821 |
Assets | 365,118 | [1] |  |  |  | 235,099 | [1] |  |  |  | 365,118 | [1] | 235,099 | [1] | 221,690 | [1]
Life Sciences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 171,518 |  | 162,799 |  | 155,324 |
Gross profit |  |  |  |  |  |  |  |  |  |  | 56,308 |  | 55,874 |  | 52,643 |
Operating Income |  |  |  |  |  |  |  |  |  |  | 28,354 |  | 25,632 |  | 24,883 |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | 429 |  | 807 |  | 901 |
Assets | 128,824 | [1] |  |  |  | 150,696 | [1],[2] |  |  |  | 128,824 | [1] | 150,696 | [1],[2] | 119,563 | [1],[2]
Physician |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  | 105,827 |  | 102,679 |  | 80,617 |
Gross profit |  |  |  |  |  |  |  |  |  |  | 30,614 |  | 31,455 |  | 25,858 |
Operating Income |  |  |  |  |  |  |  |  |  |  | 8,852 |  | 9,998 |  | 6,699 |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | 742 |  | 817 |  | 415 |
Assets | 110,519 | [1] |  |  |  | 86,074 | [1] |  |  |  | 110,519 | [1] | 86,074 | [1] | 86,014 | [1]
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  |  |  | (49,199) |  | (47,154) |  | (30,625) |
Amortization of intangible assets |  |  |  |  |  |  |  |  |  |  | $ 91 |  | $ 290 |  | $ 209 |
[1] | As of end of the year.
[2] | Life Sciences total assets as of December 31, 2012 and 2011 include assets related to the Healthcare segment, which were sold and included in discontinued operations in 2013. Historically, the Company has not reported Life Science and Healthcare segments' total assets separately as the operations were largely centralized.

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