Weighted Average Shares (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Calculation of Weighted Average Shares

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

	Year Ended December 31,
	2014	2013	2012
Basic weighted-average common shares outstanding	86,858	86,946	85,666
Effect of dilutive stock options	2,213	1,955	1,614
Diluted weighted-average common and common-equivalent shares outstanding	89,071	88,901	87,280