Repurchases Of Common Stock (Tables)

9 Months Ended

Sep. 30, 2018

Equity [Abstract]

Schedule of common stock repurchases

The following is a summary of our open market common stock repurchases, reported on a trade date basis, and shares acquired through employee surrender for the three and nine months ended September 30, 2018 and 2017(in thousands, except per share amounts): 

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2018		2017		2018		2017
Shares repurchased in the open market	302		312		1,284		1,398
Shares acquired through employee surrender for statutory tax withholding	1		2		50		55
Total shares repurchased	303		314		1,334		1,453
Cost of shares repurchased in the open market	$	73,247	$	50,413	$	265,209	$	215,320
Cost of shares for employee surrenders	390		370		9,110		7,829
Total cost of shares	$	73,637	$	50,783	$	274,319	$	223,149
Average cost per share - open market repurchases	$	242.78	$	161.57	$	206.59	$	153.99
Average cost per share - employee surrenders	$	253.34	$	155.14	$	181.68	$	142.15
Average cost per share - total	$	242.83	$	161.52	$	205.65	$	153.54