Retirement Plans and Employee Stock Purchase Plans (Tables)

12 Months Ended

Dec. 31, 2018

Retirement Plans and Employee Stock Purchase Plans

Schedule of purchases made under the 2009 Employee Stock Purchase Plans

	Year ended December 31,
	2018		2017		2016
Number of shares purchased		60,950		88,362		151,531
Average price of shares purchased	$	49.85	$	33.96	$	20.87