SHAREHOLDERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2018

Stockholders' Equity Note [Abstract]

COMMON SHARES ISSUED AND OUTSTANDING

The following table presents common shares issued and outstanding:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
Shares issued, balance at beginning of period	176,580		176,580		176,580		176,580
Shares issued	—		—		—		—
Total shares issued at end of period	176,580		176,580		176,580		176,580
Treasury shares, balance at beginning of period	(93,062	)	(91,410	)	(93,419	)	(90,139	)
Shares repurchased	(26	)	(2,004	)	(175	)	(4,233	)
Shares reissued	64		37		570		995
Total treasury shares at end of period	(93,024	)	(93,377	)	(93,024	)	(93,377	)
Total shares outstanding	83,556		83,203		83,556		83,203

SHARE REPURCHASES

The following table presents share repurchases:

	Three months ended June 30,				Six months ended June 30,
	2018		2017		2018		2017
In the open market:
Total shares	—		1,987		—		3,883
Total cost	$	—	$	129,960	$	—	$	257,943
Average price per share(1)	$	—	$	65.40	$	—	$	66.44
From employees:(2)
Total shares	26		17		175		350
Total cost	$	1,512	$	1,110	$	8,676	$	24,370
Average price per share(1)	$	57.97	$	64.82	$	49.56	$	69.55
Total shares repurchased:
Total shares	26		2,004		175		4,233
Total cost	$	1,512	$	131,070	$	8,676	$	282,313
Average price per share(1)	$	57.97	$	65.40	$	49.56	$	66.69

(1) Calculated using whole numbers.

(2) Shares are repurchased from employees to satisfy withholding tax liabilities related to the vesting of restricted stock units.