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CAPITAL STOCK AND STOCK AWARD PLANS - Summary of Nonvested Performance-Based Restricted Stock Grants (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Number of Shares and Restricted Stock Units  
Unvested, Ending Balance (in shares) | shares 846,170
Weighted Average Grant Date Fair Value  
Unvested, Ending Balance (in dollars per share) | $ / shares $ 64.91
Performance Based Restricted Stock and Restricted Stock Units  
Number of Shares and Restricted Stock Units  
Unvested, Beginning Balance (in shares) | shares 1,215,459
Granted (in shares) | shares 340,287
Vested (in shares) | shares (687,463)
Forfeitures (in shares) | shares (22,113)
Unvested, Ending Balance (in shares) | shares 846,170
Weighted Average Grant Date Fair Value  
Unvested, Beginning Balance (in dollars per share) | $ / shares $ 61.71
Granted (in dollars per share) | $ / shares 74.54
Vested (in dollars per share) | $ / shares 60.14
Forfeitures (in dollars per share) | $ / shares 60.50
Unvested, Ending Balance (in dollars per share) | $ / shares $ 68.35