Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of Average Share Amounts used to Compute Both Basic and Diluted Earnings Per Share

The following table reconciles the average share amounts used to compute both basic and diluted earnings per share (in thousands):

	Years Ended December 31,
	2017		2016		2015
Weighted average shares outstanding:
Basic weighted average shares outstanding		118,059		117,533		117,465
Add: Dilutive effect of stock options		1,385		1,314		1,454
Diluted weighted average shares outstanding		119,444		118,847		118,919