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COMMON STOCK AND STOCK INCENTIVE PLANS - Stock Option Activity (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of shares outstanding      
Options Outstanding at the beginning of the period (in shares) 415 558 576
Options Granted (in shares) 267   127
Options Exercised (in shares)   (12)  
Options Forfeited or Expired (in shares) (77) (131) (145)
Options Outstanding at the end of the period (in shares) 605 415 558
Weighted average exercise price      
Options Outstanding at the beginning of the period (in dollars per share) $ 6.11 $ 6.33 $ 21.25
Options Granted (in dollars per share) 2.24   2.83
Options Exercised (in dollars per share)   3.48  
Options Forfeited or Expired (in dollars per share) 18.79 7.30 62.79
Options Outstanding at the end of the period (in dollars per share) $ 2.78 $ 6.11 $ 6.33