Annual report pursuant to Section 13 and 15(d)

UNAUDITED QUARTERLY DATA (Details)

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UNAUDITED QUARTERLY DATA (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
UNAUDITED QUARTERLY DATA                      
Revenues $ 306,393 $ 340,179 $ 334,872 $ 289,465 $ 289,056 $ 323,929 $ 320,436 $ 271,643 $ 1,270,909 $ 1,205,064 $ 1,136,890
Gross profit (Revenues less cost of services provided) 143,368 169,701 168,879 141,383 137,854 158,832 160,791 130,745      
Net Income $ 22,914 $ 32,211 $ 33,127 $ 23,080 $ 21,595 $ 29,415 $ 31,061 $ 18,640 $ 111,332 $ 100,711 $ 90,002
Income per share:                      
Income per share Basic (in dollars per share) $ 0.16 $ 0.22 $ 0.23 $ 0.16 $ 0.15 $ 0.20 $ 0.21 $ 0.13 $ 0.76 $ 0.69 $ 0.61
Income per share Diluted (in dollars per share) $ 0.16 $ 0.22 $ 0.23 $ 0.16 $ 0.15 $ 0.20 $ 0.21 $ 0.13 $ 0.76 $ 0.69 $ 0.61