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INCENTIVE PLANS (Summary of Our Stock Option/SOSAR Activity) (Details) - SOSARs/Stock Options [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding at January 1, 2016 | shares 3,052,749
Number of Shares, Granted | shares 97,700
Number of Shares, Exercised | shares (753,251)
Number of Shares, Forfeited or expired | shares (4,767)
Number of Shares, Outstanding at December 31, 2016 | shares 2,392,431
Number of Shares, Vested and expected to vest | shares 2,379,036
Number of Shares, Exercisable at December 31, 2016 | shares 2,005,030
Weighted-average Exercise Price, Outstanding at January 1, 2016 | $ / shares $ 58.32
Weighted-average Exercise Price, Granted | $ / shares 92.02
Weighted-average Exercise Price, Exercised | $ / shares 83.29
Weighted-average Exercise Price, Forfeited or expired | $ / shares 78.22
Weighted-average Exercise Price, Outstanding at December 31, 2016 | $ / shares 51.80
Weighted-average Exercise Price, Vested and expected to vest | $ / shares 51.70
Weighted-average Exercise Price, Exercisable at December 31, 2016 | $ / shares $ 47.30
Weighted-average Remaining Contractual Life (Years), Outstanding 4 years 3 months 18 days
Weighted-average Remaining Contractual Life (Years), Vested and expected to vest 4 years 3 months 11 days
Weighted-average Remaining Contractual Life (Years), Exercisable at December 31, 2016 3 years 7 months 13 days
Aggregate Intrinsic Value, Outstanding at December 31, 2016 | $ $ 178,558
Aggregate Intrinsic Value, Vested and expected to vest | $ 177,794
Aggregate Intrinsic Value, Exercisable at December 31, 2016 | $ $ 158,651