Share Repurchase Program (Tables)

9 Months Ended

Sep. 30, 2019

Proceeds from (Repurchase of) Equity [Abstract]

Schedule of shares repurchased

	For the Three Months Ended   September 30,				For the Nine Months Ended   September 30,
	2019		2018		2019		2018
Shares repurchased	1,025		932		3,585		4,695
Average price per share	$	377.85	$	306.22	$	364.84	$	266.48
Total investment	$	387,255	$	285,183	$	1,307,947	$	1,251,013