SHARE-BASED COMPENSATION - Summary of Transactions Involving Performance Awards (Details) - $ / shares shares in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Long Term Performance Stock Unit Awards
No. of Units/Awards
Balance at beginning of period (in shares)	59	23
Changes during the period:
Granted (in shares)	0	0
Vested and settled (in shares)	0	0
Cancelled (in shares)	0	0
Balance at end of period (in shares)	59	23
Weighted Average Fair Value
Balance at beginning of period (in usd per share)	$ 37.16	$ 42.25
Changes during the period:
Granted (in usd per share)	0.00	0.00
Cancelled (in usd per share)	0.00	0.00
Balance at end of period (in usd per share)	$ 37.16	$ 42.25
Performance Shares
No. of Units/Awards
Balance at beginning of period (in shares)	13	28
Changes during the period:
Vested and settled (in shares)	0	0
Cancelled (in shares)	0	0
Balance at end of period (in shares)	13	28
Weighted Average Fair Value
Balance at beginning of period (in usd per share)	$ 35.15	$ 32.86
Changes during the period:
Vested and settled (in usd per share)	0.00	0.00
Cancelled (in usd per share)	0.00	0.00
Balance at end of period (in usd per share)	$ 35.15	$ 32.86