CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Nonvested Performance-Based Restricted Stock Grants (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Number of Shares and Restricted Stock Units
Unvested, Ending Balance (in shares) | shares	1,215,459
Weighted Average Grant Date Fair Value
Unvested, Ending Balance (in dollars per share) | $ / shares	$ 58.71
Performance Based Restricted Stock and Restricted Stock Units
Number of Shares and Restricted Stock Units
Unvested, Beginning Balance (in shares) | shares	1,245,175
Granted (in shares) | shares	310,071
Vested (in shares) | shares	(121,030)
Forfeitures (in shares) | shares	(218,757)
Unvested, Ending Balance (in shares) | shares	1,215,459
Weighted Average Grant Date Fair Value
Unvested, Beginning Balance (in dollars per share) | $ / shares	$ 55.90
Granted (in dollars per share) | $ / shares	74.14
Vested (in dollars per share) | $ / shares	55.77
Forfeitures (in dollars per share) | $ / shares	49.51
Unvested, Ending Balance (in dollars per share) | $ / shares	$ 61.71