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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity
The following table sets forth a summary of stock-settled stock appreciation rights and related information for the periods presented:
Year Ended December 31,
 202020192018
AwardsWeighted-Average
Exercise
Price		Weighted-Average
Remaining
Contractual
Life		Aggregate
Intrinsic
Value
(In thousands)		AwardsWeighted-Average
Exercise
Price		AwardsWeighted-Average
Exercise
Price
Beginning of year2,337,049 $59.72   2,351,633 $59.26 2,238,607 $57.75 
Granted262,091 48.32   213,618 54.63 509,046 62.68 
Exercised(391,339)47.11   (113,099)35.01 (192,700)40.74 
Canceled(46,245)65.93   (115,103)65.27 (203,320)68.69 
End of year2,161,556 60.48 5.7$39,834 2,337,049 59.72 2,351,633 59.26 
Exercisable at end of year
1,630,891 $62.72 4.8$26,622 1,723,370 $59.00 1,453,932 $57.93 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following table sets forth the weighted-average assumptions used to estimate the fair value of stock-settled stock appreciation rights granted during the periods presented:
Year Ended December 31,
202020192018
Stock-settled stock appreciation rights granted262,091213,618509,046
   Risk free interest rate1.4%2.5%2.5%
   Expected life (in years)555
   Expected volatility30%29%28%
Schedule of Share-based Compensation, Restricted Stock Units Award Activity
The following table sets forth a summary of time-based restricted stock units and related information for the periods presented:
Year Ended December 31,
202020192018
AwardsWeighted-Average
Fair
Value		AwardsWeighted-Average
Fair
Value		AwardsWeighted-Average
Fair
Value
Unvested at beginning of year363,729 $60.00 327,798 $57.87 290,054 $58.11 
Granted656,717 37.44 192,106 54.13 122,062 62.40 
Vested(83,253)69.17 (136,777)46.52 (64,166)67.91 
Forfeited(15,698)56.79 (19,398)59.62 (20,152)58.15 
Unvested at end of year921,495 $43.15 363,729 $60.00 327,798 $57.87 
The following table sets forth a summary of performance-based awards and related information for the periods presented:
Year Ended December 31,
202020192018
AwardsWeighted-Average
Fair
Value		AwardsWeighted-Average
Fair
Value		AwardsWeighted-Average
Fair
Value
Unvested at beginning of year195,305 $60.24 138,896 $59.33 148,508 $60.23 
     Granted158,756 49.56 126,874 54.64 44,144 62.80 
     Vested(25,909)78.04 (25,696)42.44 — — 
     Forfeited(22,883)69.39 (44,769)52.11 (53,756)64.67 
Unvested at end of year305,269 $52.61 195,305 $60.24 138,896 $59.33