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INCENTIVE PLANS (Summary of Our Stock Option/SOSAR Activity) (Details) - SOSARs And Stock Options [Member]
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding at January 1, 2017 | shares 2,392,431
Number of Shares, Granted | shares 79,200
Number of Shares, Exercised | shares (226,280)
Number of Shares, Forfeited or expired | shares (2,864)
Number of Shares, Outstanding at December 31, 2017 | shares 2,242,487
Number of Shares, Vested and expected to vest | shares 2,233,801
Number of Shares, Exercisable at December 31, 2017 | shares 1,957,871
Weighted-average Exercise Price, Outstanding at January 1, 2017 | $ / shares $ 51.80
Weighted-average Exercise Price, Granted | $ / shares 122.60
Weighted-average Exercise Price, Exercised | $ / shares 64.75
Weighted-average Exercise Price, Forfeited or expired | $ / shares 74.62
Weighted-average Exercise Price, Outstanding at December 31, 2017 | $ / shares 52.95
Weighted-average Exercise Price, Vested and expected to vest | $ / shares 52.89
Weighted-average Exercise Price, Exercisable at December 31, 2017 | $ / shares $ 47.27
Weighted-average Remaining Contractual Life (Years), Outstanding 3 years 8 months 23 days
Weighted-average Remaining Contractual Life (Years), Vested and expected to vest 3 years 8 months 19 days
Weighted-average Remaining Contractual Life (Years), Exercisable at December 31, 2017 3 years 1 month 21 days
Aggregate Intrinsic Value, Outstanding at December 31, 2017 | $ $ 169,034
Aggregate Intrinsic Value, Vested and expected to vest | $ 168,513
Aggregate Intrinsic Value, Exercisable at December 31, 2017 | $ $ 158,700