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Business Segments (Segment Reporting Information) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 620,884 | $ 629,401 | $ 608,088 | $ 582,040 | $ 577,517 | $ 572,123 | $ 485,323 | $ 430,045 | $ 2,440,413 | $ 2,065,008 | $ 1,724,741
Gross profit | $ 198,195 | $ 207,120 | $ 202,086 | $ 187,782 | $ 192,932 | $ 191,404 | $ 158,534 | $ 135,875 | 795,183 | 678,745 | 557,435
Operating Income |  |  |  |  |  |  |  |  | 189,726 | 152,108 | 137,782
Amortization of intangible assets |  |  |  |  |  |  |  |  | $ 39,628 | 34,467 | 22,130
Reportable segments (in number of segments) | property |  |  |  |  |  |  |  |  | 2 |  |
Apex |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 1,836,488 | 1,493,608 | 1,198,140
Gross profit |  |  |  |  |  |  |  |  | 548,421 | 439,586 | 338,023
Operating Income |  |  |  |  |  |  |  |  | 195,133 | 151,450 | 121,838
Amortization of intangible assets |  |  |  |  |  |  |  |  | 34,359 | 28,371 | 16,356
Oxford |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 603,925 | 571,400 | 526,601
Gross profit |  |  |  |  |  |  |  |  | 246,762 | 239,159 | 219,412
Operating Income |  |  |  |  |  |  |  |  | 51,294 | 59,059 | 58,741
Amortization of intangible assets |  |  |  |  |  |  |  |  | 5,269 | 6,096 | 5,765
Corporate |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | (56,701) | (58,401) | (42,797)
Amortization of intangible assets |  |  |  |  |  |  |  |  | 0 | 0 | 9
Assignment [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 2,312,271 | 1,947,001 | 1,641,706
PermanentPlacement [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 128,142 | $ 118,007 | $ 83,035

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