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STOCK-BASED COMPENSATION. (Restricted Shares and Stock Units) (Details)
6 Months Ended
Jun. 30, 2019
$ / 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, 2018 (in dollars per share) | $ / shares $ 87.07
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) | $ / shares 97.65
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) | $ / shares 87.81
Weighted-average fair value of nonvested restricted shares and restricted stock units at March 31, 2019 (in dollars per share) | $ / shares 87.02
Time-based grants [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 $ 100.03
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, 2018 (in shares) 136,964
Vested (in shares) (8,710)
Forfeited (in shares) (7,119)
Nonvested at March 31, 2019 (in shares) 128,539
Restricted shares [Member] | Time-based grants [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Grants (in shares) 7,404
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 March 31, 2019 (in shares) 2,400
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) 2,400
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, 2018 (in shares) 6,603,920
Vested (in shares) (55,360)
Forfeited (in shares) (269,073)
Nonvested at March 31, 2019 (in shares) 6,313,708
Restricted stock units [Member] | Time-based grants [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Grants (in shares) 34,221
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 March 31, 2019 (in shares) 450,727
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) 289,906