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COMMON STOCK AND STOCK INCENTIVE PLANS - Unvested Restricted Awards (Details) - Restricted Stock
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Restricted stock awards      
Ratio for grant of stock awards that is deducted from the shares available for grant 1    
Shares      
Total nonvested restricted stock at the beginning of the period (in shares) | shares 1,056 1,481 1,713
Granted (in shares) | shares 1,124 422 808
Vested (in shares) | shares (624) (427) (603)
Forfeited (in shares) | shares (118) (420) (437)
Total nonvested restricted stock at the end of the period (in shares) | shares 1,438 1,056 1,481
Weighted average grant date fair value      
Total nonvested restricted stock at the beginning of the period (in dollars per share) | $ / shares $ 2.72 $ 2.90 $ 3.08
Granted (in dollars per share) | $ / shares 2.19 2.47 2.76
Vested (in dollars per share) | $ / shares 2.77 3.07 3.15
Forfeited (in dollars per share) | $ / shares 2.70 2.76 3.02
Total nonvested restricted stock at the end of the period (in dollars per share) | $ / shares $ 2.28 $ 2.72 $ 2.90
Fair value of restricted stock awards vested | $ $ 1.7 $ 1.3 $ 1.9
Minimum      
Restricted stock awards      
Vesting period 1 year    
Maximum      
Restricted stock awards      
Vesting period 4 years