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STOCK-BASED COMPENSATION - Schedule of Options Outstanding and Exercisable (Details)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Options Outstanding and Exercisable  
Outstanding Options (in shares) | shares 5,265,370
Weighted Average Exercise Price (in USD per share) $ 5.78
Weighted Average Remaining Contractual Life 4 years 5 months
Options Exercisable (in shares) | shares 4,035,588
Weighted Average Exercise Price (in USD per share) $ 6.68
$0.00 - $2.06  
Options Outstanding and Exercisable  
Minimum range of option exercise price (in USD per share) 0
Maximum range of option exercise price (in USD per share) $ 2.06
Outstanding Options (in shares) | shares 552,810
Weighted Average Exercise Price (in USD per share) $ 1.19
Weighted Average Remaining Contractual Life 6 years 4 days
Options Exercisable (in shares) | shares 110,000
Weighted Average Exercise Price (in USD per share) $ 1.53
$2.06 - $4.13  
Options Outstanding and Exercisable  
Minimum range of option exercise price (in USD per share) 2.06
Maximum range of option exercise price (in USD per share) $ 4.13
Outstanding Options (in shares) | shares 1,350,984
Weighted Average Exercise Price (in USD per share) $ 2.67
Weighted Average Remaining Contractual Life 5 years 9 months 4 days
Options Exercisable (in shares) | shares 801,680
Weighted Average Exercise Price (in USD per share) $ 2.73
$4.13 - $6.19  
Options Outstanding and Exercisable  
Minimum range of option exercise price (in USD per share) 4.13
Maximum range of option exercise price (in USD per share) $ 6.19
Outstanding Options (in shares) | shares 572,000
Weighted Average Exercise Price (in USD per share) $ 4.84
Weighted Average Remaining Contractual Life 4 years 6 months 75 days
Options Exercisable (in shares) | shares 464,334
Weighted Average Exercise Price (in USD per share) $ 4.75
$6.19 - $8.25  
Options Outstanding and Exercisable  
Minimum range of option exercise price (in USD per share) 6.19
Maximum range of option exercise price (in USD per share) $ 8.25
Outstanding Options (in shares) | shares 1,898,576
Weighted Average Exercise Price (in USD per share) $ 7.06
Weighted Average Remaining Contractual Life 3 years 3 months 55 days
Options Exercisable (in shares) | shares 1,768,574
Weighted Average Exercise Price (in USD per share) $ 7.01
$8.25 - $10.32  
Options Outstanding and Exercisable  
Minimum range of option exercise price (in USD per share) 8.25
Maximum range of option exercise price (in USD per share) $ 10.32
Outstanding Options (in shares) | shares 252,500
Weighted Average Exercise Price (in USD per share) $ 9.09
Weighted Average Remaining Contractual Life 1 year
Options Exercisable (in shares) | shares 252,500
Weighted Average Exercise Price (in USD per share) $ 9.09
$10.32 - $12.38  
Options Outstanding and Exercisable  
Minimum range of option exercise price (in USD per share) 10.32
Maximum range of option exercise price (in USD per share) $ 12.38
Outstanding Options (in shares) | shares 305,000
Weighted Average Exercise Price (in USD per share) $ 11.04
Weighted Average Remaining Contractual Life 5 years
Options Exercisable (in shares) | shares 305,000
Weighted Average Exercise Price (in USD per share) $ 11.04
$12.38 - $14.41  
Options Outstanding and Exercisable  
Minimum range of option exercise price (in USD per share) 12.38
Maximum range of option exercise price (in USD per share) $ 14.41
Outstanding Options (in shares) | shares 325,500
Weighted Average Exercise Price (in USD per share) $ 12.92
Weighted Average Remaining Contractual Life 2 years 10 months 9 days
Options Exercisable (in shares) | shares 325,500
Weighted Average Exercise Price (in USD per share) $ 12.92
$16.50 - $18.57  
Options Outstanding and Exercisable  
Minimum range of option exercise price (in USD per share) 16.50
Maximum range of option exercise price (in USD per share) $ 18.57
Outstanding Options (in shares) | shares 8,000
Weighted Average Exercise Price (in USD per share) $ 16.63
Weighted Average Remaining Contractual Life 6 years 5 months 67 days
Options Exercisable (in shares) | shares 8,000
Weighted Average Exercise Price (in USD per share) $ 16.63