Annual report pursuant to Section 13 and 15(d)

UNAUDITED QUARTERLY DATA (Details)

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UNAUDITED QUARTERLY DATA (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 505,985 $ 556,466 $ 523,957 $ 429,069 $ 444,623 $ 487,739 $ 480,461 $ 408,742 $ 2,015,477 $ 1,821,565 $ 1,673,957
Gross profit (Revenues less cost of services provided) 251,701 287,748 270,624 211,811 223,389 251,452 249,689 202,599      
Net Income $ 50,762 $ 44,064 $ 64,295 $ 44,226 $ 50,968 $ 66,628 $ 65,542 $ 48,525 $ 203,347 $ 231,663 $ 179,124
Income per share:                      
Income per share-Basic $ 0.16 $ 0.13 $ 0.20 $ 0.14 $ 0.16 $ 0.20 $ 0.20 $ 0.15 $ 0.62 $ 0.71 $ 0.55
Income per share-Diluted $ 0.16 $ 0.13 $ 0.20 $ 0.14 $ 0.16 $ 0.20 $ 0.20 $ 0.15 $ 0.62 $ 0.71 $ 0.55