SHAREHOLDERS' EQUITY (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

COMMON SHARES ISSUED AND OUTSTANDING

The following table presents changes in common shares issued and outstanding, excluding restricted stock units related to the Company's share-based compensation plans (refer to Note 16 'Share-Based Compensation'):

Year ended December 31,	2018		2017		2016
Shares issued, balance at beginning of year	176,580		176,580		176,240
Shares issued	—		—		340
Total shares issued at end of year	176,580		176,580		176,580
Treasury shares, balance at beginning of year	(93,419	)	(90,139	)	(80,174	)
Shares repurchased	(200	)	(4,288	)	(10,508	)
Shares reissued	625		1,008		543
Total treasury shares at end of year	(92,994	)	(93,419	)	(90,139	)
Total shares outstanding	83,586		83,161		86,441

SHARE REPURCHASES

The following table presents common shares repurchased from shares held in treasury:

Year ended December 31,	2018		2017		2016
In the open market:
Total shares(1)	—		3,932		10,241
Total cost	$	—	$	261,180	$	557,476
Average price per share(2)	$	—	$	66.43	$	54.44
From employees:(3)
Total shares	200		356		267
Total cost	$	10,080	$	24,678	$	14,329
Average price per share(2)	$	50.40	$	69.36	$	53.74
Total shares repurchased:
Total shares	200		4,288		10,508
Total cost	$	10,080	$	285,858	$	571,805
Average price per share(2)	$	50.40	$	66.67	$	54.42

(1) Amounts in 2016 include common shares acquired under the accelerated share repurchase program of 1,358,380 (see below for more detail).

(2) Calculated using whole numbers.

(3) Shares are repurchased from employees to satisfy withholding tax liabilities that arise upon the vesting of restricted stock awards and restricted stock units. Share repurchases from employees are excluded from the authorized share repurchase plan noted above.