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Repurchases Of Common Stock
 6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Repurchases Of Common Stock REPURCHASES OF COMMON STOCK
We primarily acquire shares by repurchases in the open market. However, we also acquire shares that are surrendered by employees in payment for the minimum required statutory withholding taxes due on the vesting of restricted stock units and the settlement of deferred stock units, otherwise referred to herein as employee surrenders. We issue shares of treasury stock upon the vesting of certain restricted stock units and upon the exercise of certain stock options. The number of shares of treasury stock issued during the three and six months ended June 30, 2021 and 2020 was not material.

The following is a summary of our open market common stock repurchases, reported on a trade date basis, and shares acquired through employee surrender:
(in thousands, except per share amounts)
For the Three Months Ended
June 30,		For the Six Months Ended
June 30,
2021202020212020
  
Shares repurchased in the open market341 — 618 721 
Shares acquired through employee surrender for statutory tax withholding (1)
— — 28 30 
Total shares repurchased341 — 646 751 
Cost of shares repurchased in the open market$188,409 $— $327,622 $179,623 
Cost of shares for employee surrenders3 65 14,986 8,669 
Total cost of shares$188,412 $65 $342,608 $188,292 
Average cost per share - open market repurchases$552.08 $— $529.45 $249.20 
Average cost per share - employee surrenders$550.59 $312.19 $544.08 $288.94 
Average cost per share - total$552.08 $312.19 $530.07 $250.79 
(1) For the quarters ended June 30, 2021 and 2020, the number of shares acquired though employee surrender for statutory tax withholding were below rounding thresholds.