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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2019
Schedule of Total Stock-Based Compensation Expense Included in Company's Consolidated Statements of Income and Comprehensive Income
The total stock-based compensation expense included in the Company’s consolidated statements of income and comprehensive income was as follows:
                                 
 
Three Months Ended 
June 30,
   
Six Months Ended 
June 30,
 
 
2019
   
2018
   
2019
   
2018
 
Cost of revenues
  $
636
    $
1,489
    $
1,058
    $
2,494
 
Research and development expense
   
1,061
     
819
     
1,871
     
1,541
 
Selling, general and administrative expense
   
4,206
     
4,058
     
12,244
     
12,757
 
                                 
Acquisition and integration related expense
   
1,026
     
—  
      
19,594
     
—  
  
                                 
Total
pre-tax
stock-based compensation expense
   $
6,929
    $
6,366
    $
34,767
    $
16,792
 
                                 
 
 
 
 
 
 
 
 
 
 
 
 
Summary of Activity for RSUs
The following table presents the activity for RSUs under the Plan:
                 
 
Six Months Ended June 30, 2019
 
 
Outstanding RSUs
   
Weighted Average
Grant Date
Fair Value
 
RSUs – beginning of period
   
647,394
    $
74.04
 
Assumed shares from ESI Merger
   
736,133
    $
84.10
 
Accrued dividend shares
   
3,084
    $
76.13
 
Granted
   
396,192
    $
86.54
 
Vested
   
(513,370
)   $
68.66
 
Forfeited
   
(87,666
)   $
90.98
 
                 
RSUs – end of period
   
1,181,767
    $
85.59
 
                 
 
 
 
 
 
 
 
 
 
 
 
 
Stock Appreciation Rights (SARs) [Member]  
Summary of Activity for Outstanding and Exercisable Stock Appreciation Rights
The following table presents the activity for SARs under the Plan:
                 
 
Six Months Ended June 30, 2019
 
 
Outstanding SARs
   
Weighted Average
Grant Date
Fair Value
 
SARs – beginning of period
   
177,538
    $
28.52
 
Assumed SARs from ESI Merger
   
12,787
    $
17.38
 
Exercised
   
(38,999
)   $
26.80
 
Forfeited or expired
   
(3,857
)   $
23.02
 
                 
SARs Outstanding – end of period
   
147,469
    $
28.19