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, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
UNAUDITED QUARTERLY DATA                      
Revenues $ 289,056 $ 323,929 $ 320,436 $ 271,643 $ 279,928 $ 305,118 $ 298,803 $ 253,041 $ 1,205,064 $ 1,136,890 $ 1,073,958
Gross profit (Revenues less cost of services provided) 137,854 158,832 160,791 130,745 132,306 149,054 150,375 122,066      
Net Income $ 21,595 $ 29,415 $ 31,061 $ 18,640 $ 19,206 $ 25,513 $ 27,700 $ 17,583 $ 100,711 $ 90,002 $ 83,984
Income per share:                      
Income per share Basic $ 0.15 $ 0.20 $ 0.21 $ 0.13 $ 0.13 $ 0.17 $ 0.19 $ 0.12 $ 0.69 $ 0.61 $ 0.56
Income per share Diluted (in dollars per share) $ 0.15 $ 0.20 $ 0.21 $ 0.13 $ 0.13 $ 0.17 $ 0.19 $ 0.12 $ 0.69 $ 0.61 $ 0.56