Annual report pursuant to Section 13 and 15(d)

UNAUDITED QUARTERLY DATA (Details)

v3.3.1.900
UNAUDITED QUARTERLY DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
UNAUDITED QUARTERLY DATA                      
Revenues $ 362,500 $ 399,746 $ 392,150 $ 330,909 $ 343,951 $ 384,870 $ 369,357 $ 313,388 $ 1,485,305 $ 1,411,566 $ 1,337,374
Gross profit (Revenues less cost of services provided) 180,265 204,257 201,941 162,866 168,972 196,060 186,715 152,080      
Net Income $ 31,749 $ 45,046 $ 45,073 $ 30,281 $ 29,917 $ 41,121 $ 40,860 $ 25,766 $ 152,149 $ 137,664 $ 123,330
Income per share:                      
Income per share Basic (in dollars per share) $ 0.15 $ 0.21 $ 0.21 $ 0.14 $ 0.14 $ 0.19 $ 0.19 $ 0.12 $ 0.70 $ 0.63 $ 0.56
Income per share Diluted (in dollars per share) $ 0.15 $ 0.21 $ 0.21 $ 0.14 $ 0.14 $ 0.19 $ 0.19 $ 0.12 $ 0.70 $ 0.63 $ 0.56