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Reportable Segments (Tables)
 12 Months Ended
Dec. 31, 2018
Segment Reporting [Abstract]  
Operations of Segments The following table provides information concerning the operations of our segments for the years ended December 31 (in thousands):
 
Tech
 
FA
 
GS
 
Total
2018
 
 
 
 
 
 
 
Revenue
$
990,089

 
$
313,848

 
$
114,416

 
$
1,418,353

Gross profit
$
277,388

 
$
109,099

 
$
32,121

 
$
418,608

Operating and other expenses
 
 
 
 
 
 
341,455

Income before income taxes
 
 
 
 
 
 
$
77,153

2017
 
 
 
 
 
 
 
Revenue
$
907,511

 
$
346,135

 
$
104,294

 
$
1,357,940

Gross profit
$
257,118

 
$
118,479

 
$
32,459

 
$
408,056

Operating and other expenses
 
 
 
 
 
 
343,962

Income before income taxes
 
 
 
 
 
 
$
64,094

2016
 
 
 
 
 
 
 
Revenue
$
883,477

 
$
337,601

 
$
98,628

 
$
1,319,706

Gross profit
$
255,842

 
$
120,551

 
$
32,106

 
$
408,499

Operating and other expenses
 
 
 
 
 
 
352,544

Income before income taxes
 
 
 
 
 
 
$
55,955