CAPITAL STOCK (Tables)

12 Months Ended

Dec. 31, 2017

CAPITAL STOCK

Schedule of number of shares of common stock and treasury stock and the share activity

	Common Shares		Treasury Shares
	2017	2016	2017	2016
Balance at the beginning of the year	66,012,843	66,685,378	3,865,863	4,168,489
Employee option exercises	1,173,936	1,001,748	(394,991)	(302,626)
Director option exercises	—	22,167	—	—
Restricted stock vestings	67,708	30,228	—	—
Common stock repurchases	—	—	1,411,017	—
Common stock repurchased and retired	(511,997)	(1,726,678)	—	—
Balance at the end of the year	66,742,490	66,012,843	4,881,889	3,865,863