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STOCK-BASED COMPENSATION. (Restricted Shares and Stock Units) (Details)
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-average fair value of nonvested restricted shares and restricted stock units at December 31, 2017 (in dollars per share) | $ / shares $ 82.37
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) | $ / shares 71.62
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) | $ / shares 78.16
Weighted-average fair value of nonvested restricted shares and restricted stock units at September 30, 2018 (in dollars per share) | $ / shares 82.78
Time-based [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted-average fair value of restricted shares and restricted stock units granted (in dollars per share) | $ / shares $ 112.46
Restricted shares [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested at December 31, 2017 (in shares) 473,115
Vested (in shares) (20,580)
Forfeited (in shares) (8,092)
Nonvested at September 30, 2018 (in shares) 453,218
Restricted shares [Member] | Time-based [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Grants (in shares) 8,775
Restricted shares [Member] | Performance-based [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested at September 30, 2018 (in shares) 7,200
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Nonvested shares where performance threshold has been met (in shares) 7,200
Restricted stock units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested at December 31, 2017 (in shares) 5,556,911
Vested (in shares) (55,148)
Forfeited (in shares) (99,186)
Nonvested at September 30, 2018 (in shares) 5,432,164
Restricted stock units [Member] | Time-based [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Grants (in shares) 29,587
Restricted stock units [Member] | Performance-based [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested at September 30, 2018 (in shares) 406,412
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Nonvested shares where performance threshold has been met (in shares) 291,958