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CAPITAL STOCK AND STOCK AWARD PLANS - Unvested Performance-Based Restricted Shares and Restricted Stock Units (Details) - Performance-based restricted shares and restricted stock units
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Number of Restricted Shares and Restricted Stock Units  
Unvested, beginning balance (in shares) | shares 841,793
Granted (in shares) | shares 405,915
Vested (in shares) | shares 0
Forfeitures (in shares) | shares (145,497)
Unvested, ending balance (in shares) | shares 1,102,211
Weighted Average Grant Date Fair Value  
Unvested, beginning balance (in dollars per share) | $ / shares $ 68.68
Granted (in dollars per share) | $ / shares 59.34
Vested (in dollars per share) | $ / shares 0
Forfeitures (in dollars per share) | $ / shares 52.70
Unvested, ending balance (in dollars per share) | $ / shares $ 67.29