Weighted Average Shares (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Calculation of Weighted Average Shares

Weighted-average shares were calculated as follows (in thousands):

	Year Ended December 31,
	2016	2015	2014
Basic weighted-average common shares outstanding	85,338	86,296	86,858
Effect of dilutive stock options	1,734	1,695	2,213
Diluted weighted-average common and common-equivalent shares outstanding	87,072	87,991	89,071