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UNAUDITED QUARTERLY DATA
12 Months Ended
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]  
UNAUDITED QUARTERLY DATA

20.           UNAUDITED QUARTERLY DATA

                 
(in thousands except per share data)  First   Second   Third   Fourth 
2019                    
Revenues  $429,069   $523,957   $556,466   $505,985 
Gross profit (Revenues less cost of services provided)  $211,811   $270,624   $287,748   $251,701 
Net Income  $44,226   $64,295   $44,064   $50,762 
Income per share:                    
Income per share-Basic  $0.14   $0.20   $0.13   $0.16 
Income per share-Diluted  $0.14   $0.20   $0.13   $0.16 
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