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CAPITAL STOCK (Tables)
 12 Months Ended
Dec. 31, 2017
CAPITAL STOCK [Abstract]  
Activity of Outstanding Common Stock
  
December 31,
 
  
2017
  
2016
  
2015
 
Common Stock:
 
Quantity (in thousands)
 
Balance, beginning of period
  
17,197
   
14,390
   
14,375
 
Issuance of shares for compensation net of withholding
  
119
   
84
   
15
 
Issuance of common stock related to equity distribution agreements
  
-
   
2,723
   
-
 
Balance, end of period
  
17,316
   
17,197
   
14,390
 
Activity of Common Stock Held in Treasury
  
December 31,
 
  
2017
  
2016
  
2015
 
Treasury Shares:
 
Quantity (in thousands)
 
Balance, beginning of period
  
-
   
264
   
280
 
Issuance of treasury shares for acquisition
  
-
   
-
   
(149
)
Purchase of treasury shares
  
-
   
-
   
191
 
Issuance of treasury shares upon vesting of restricted shares net of withholding
  
-
   
(264
)
  
(58
)
Balance, end of period
  
-
   
-
   
264