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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2016
STOCK-BASED COMPENSATION [Abstract]  
Employee and Non-employee Restricted Stock Plan
The following table provides certain information regarding the shares authorized and outstanding under the Restricted Stock Plans at June 30, 2016:

Number of shares authorized for grants
  
1,300,000
 
Number of shares granted
  
(883,199
)
Number of shares forfeited
  
158,876
 
Number of shares expired from 2005 plan
  
(81,527
)
Number of shares available for future grants
  
494,150
 
Weighted-average grant price of granted shares
 
$
28.26
 
Changes in Restricted Stock
Changes in restricted stock for the six months ended June 30, 2016 were as follows:

  
Number of
Shares
  
Weighted
Average
Grant Price
 
Non-vested at December 31, 2015
  
137,507
  
$
54.58
 
Granted
  
10,000
  
$
16.35
 
Forfeited
  
(15,000
)
 
$
91.56
 
Vested
  
(46,642
)
 
$
52.32
 
Non-vested at June 30, 2016
  
85,865
  
$
44.89