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Repurchases of Common Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Common Stock Repurchases
The following is a summary of our open market common stock repurchases and shares acquired through employee surrender for the years ended December 31, 2018, 2017 and 2016 (in thousands, except per share amounts):

 
For the Years Ended December 31,

 
2018
 
2017
 
2016

 
 

 
 

 
 

Shares repurchased in the open market
 
1,773

 
1,749

 
3,071

Shares acquired through employee surrender for statutory tax withholding
 
52

 
57

 
60

Total shares repurchased
 
1,825

 
1,806

 
3,131


 
 
 
 
 
 
Cost of share repurchased in the open market
 
$
368,691

 
$
270,297

 
$
313,072

Cost of shares for employee surrenders
 
9,375

 
8,074

 
4,372

Total cost of shares
 
$
378,066

 
$
278,371

 
$
317,444


 
 
 
 
 
 
Average cost per share - open market repurchases
 
$
207.92

 
$
154.51

 
$
101.96

Average cost per share - employee surrenders
 
$
182.18

 
$
142.55

 
$
73.04

Average cost per share - total
 
$
207.19

 
$
154.13

 
$
101.40