CAPITAL STOCK

12 Months Ended

Dec. 31, 2020

The Company had no shares of preferred stock outstanding as of December 31, 2020 and 2019. The activity related to outstanding common stock and common stock held in treasury was as follows:


	2020		2019		2018
	Outstanding Common Stock	Treasury Stock	Outstanding Common Stock	Treasury Stock	Outstanding Common Stock	Treasury Stock
Balance at beginning of period	53,687,528	55,971,691	55,862,360	53,796,859	56,328,863	53,330,356
Exercise of stock options	311,374	(311,374)	232,052	(232,052)	930,258	(930,258)
Settlement of restricted stock units, net of 41,019, 26,107, and 39,075 shares retained, respectively	82,241	(82,241)	52,182	(52,182)	80,988	(80,988)
Settlement of performance share units, net of 16,830, 6,737, and 1,027 shares retained, respectively	28,098	(28,098)	14,027	(14,027)	1,911	(1,911)
Purchase of treasury shares	(1,584,850)	1,584,850	(2,473,093)	2,473,093	(1,479,660)	1,479,660
Balance at end of period	52,524,391	57,134,828	53,687,528	55,971,691	55,862,360	53,796,859