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UNAUDITED QUARTERLY DATA (Tables)
12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Schedule of unaudited quarterly data
(in thousands except per share data)  First  Second  Third  Fourth
2018                    
Revenues  $408,742   $480,461   $487,739   $444,623 
Gross profit (Revenues less cost of services provided)  $202,599   $249,689   $251,452   $223,389 
Net income  $48,525   $65,542   $66,628   $50,968 
Income per share:                    
Income per share—Basic  $0.15   $0.20   $0.20   $0.16 
Income per share—Diluted  $0.15   $0.20   $0.20   $0.16 
2017                    
Revenues  $375,247   $433,555   $450,442   $414,713 
Gross profit (Revenues less cost of services provided)  $186,084   $229,075   $231,661   $207,194 
Net income  $40,270   $53,689   $51,430   $33,735 
Income per share:                    
Income per share—Basic  $0.12   $0.17   $0.16   $0.10 
Income per share—Diluted  $0.12   $0.17   $0.16   $0.10