Weighted Average Shares (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Calculation of Weighted Average Shares

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

	Year Ended December 31,
	2020	2019	2018
Basic weighted-average common shares outstanding	173,489	171,194	172,333
Effect of dilutive stock awards	3,103	4,075	5,073
Diluted weighted-average common and common-equivalent shares outstanding	176,592	175,269	177,406