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UNAUDITED QUARTERLY DATA
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
UNAUDITED QUARTERLY DATA
UNAUDITED QUARTERLY DATA
(in thousands except per share data)
First
 
Second
 
Third
 
Fourth
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
$
0.18

 
$
0.25

 
$
0.24

 
$
0.15

Income per share—Diluted
$
0.18

 
$
0.25

 
$
0.24

 
$
0.15

2016
 

 
 

 
 

 
 

Revenues
$
352,736

 
$
411,133

 
$
423,994

 
$
385,614

Gross profit (Revenues less cost of services provided)
$
174,934

 
$
215,190

 
$
218,386

 
$
192,619

Net income
$
31,928

 
$
47,783

 
$
49,651

 
$
38,007

Income per share:
 

 
 

 
 

 
 

Income per share—Basic
$
0.15

 
$
0.22

 
$
0.23

 
$
0.17

Income per share—Diluted
$
0.15

 
$
0.22

 
$
0.23

 
$
0.17