SHARE-BASED COMPENSATION - Summary of Transactions Involving Stock Options (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2018 $ / shares shares
No. of Options
Shares under option, beginning of period | shares	79
Changes during the period:
Granted | shares	0
Exercised | shares	0
Cancelled | shares	0
Expired | shares	(2)
Shares under option, end of period | shares	77
Exercisable at end of period (in shares) | shares	77
Weighted Average Exercise Price
Shares under option, beginning of period | $ / shares	$ 31.94
Changes during the period:
Granted | $ / shares	0.00
Exercised | $ / shares	0.00
Cancelled | $ / shares	0.00
Expired | $ / shares	34.19
Shares under option, end of period | $ / shares	31.88
Exercisable at end of period | $ / shares	$ 31.88