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STOCK-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
A summary of the Company's Restricted Stock/Unit award activity during the years ended December 31, 2018, 2017 and 2016 follows:
 
Shares/Units
 
Weighted Average
Grant-Date
Fair Value
Unvested at January 1, 2016
231,562

 
$
42.33

Granted (38,934 non-voting)
177,775

 
47.74

Vested
(104,297
)
 
41.47

Forfeited
(14,321
)
 
42.54

Unvested at December 31, 2016
290,719

 
42.26

Granted (41,318 non-voting)
153,777

 
55.86

Vested
(103,259
)
 
43.81

Forfeited
(39,160
)
 
39.83

Unvested at December 31, 2017
302,077

 
48.97

Granted (159,541 non-voting)
161,598

 
55.04

Vested
(103,363
)
 
48.60

Forfeited
(42,215
)
 
47.05

Unvested at December 31, 2018
318,097

 
52.43