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EMPLOYEE COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
EMPLOYEE COMPENSATION PLANS [Abstract]  
Summary of non-vested RSU's and performance-based RSU's

 

 

 

 

 

 

 

 

    

 

    

Weighted

 

 

 

 

 

Average

 

 

 

 

 

Grant Date

 

 

 

Shares

 

Fair Value

 

 

 

 

 

 

 

 

Unvested as of December 31, 2017

 

1,290,427

 

$

27.87

 

Granted

 

482,398

 

$

35.15

 

Vested

 

(458,444)

 

$

27.35

 

Cancellations/expirations

 

(172,943)

 

$

30.38

 

Unvested as of December 31, 2018

 

1,141,438

 

$

30.78