INCENTIVE PLANS (Summary of Our Stock Option/SOSAR Activity) (Details) - Employee Stock Options [Member] $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at January 1, 2015 | shares	4,786,305
Number of Shares, Granted | shares	161,310
Number of Shares, Exercised | shares	(1,890,028)
Number of Shares, Forfeited or expired | shares	(4,838)
Number of Shares, Outstanding at December 31, 2015 | shares	3,052,749
Number of Shares, Vested and expected to vest | shares	3,038,898
Number of Shares, Exercisable at December 31, 2015 | shares	2,602,447
Weighted-average Exercise Price, Outstanding at January 1, 2015 | $ / shares	$ 59.65
Weighted-average Exercise Price, Granted | $ / shares	79.41
Weighted-average Exercise Price, Exercised | $ / shares	63.48
Weighted-average Exercise Price, Forfeited or expired | $ / shares	64.48
Weighted-average Exercise Price, Outstanding at December 31, 2015 | $ / shares	58.32
Weighted-average Exercise Price, Vested and expected to vest | $ / shares	58.27
Weighted-average Exercise Price, Exercisable at December 31, 2015 | $ / shares	$ 56.65
Weighted-average Remaining Contractual Life (Years), Outstanding	4 years 4 months 10 days
Weighted-average Remaining Contractual Life (Years), Vested and expected to vest	4 years 4 months 6 days
Weighted-average Remaining Contractual Life (Years), Exercisable at December 31, 2015	3 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding at December 31, 2015 | $	$ 118,401
Aggregate Intrinsic Value, Vested and expected to vest | $	118,043
Aggregate Intrinsic Value, Exercisable at December 31, 2015 | $	$ 106,100