Share Repurchase Program (Tables)

12 Months Ended

Dec. 31, 2016

Proceeds from (Repurchase of) Equity [Abstract]

Schedule of shares repurchased

	For the Year Ended   December 31,
	2016		2015
Shares repurchased	5,698		4,901
Average price per share	$	264.21	$	231.81
Total investment	$	1,505,371	$	1,136,139