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STOCKHOLDERS' EQUITY AND SHARE-BASED COMPENSATION EXPENSE - Share-based Compensation Plans Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2010
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options issue price as percentage of fair value   100.00%
Stock options issue price as percentage of fair value, certain circumstances   110.00%
Options available for future grants (in shares)   5,189,000
Unrecognized share-based compensation expense   $ 18.4
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition, Stock Options   2 years 1 month 6 days
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition, Restricted Stock   2 years 1 month 25 days
Two Thousand Fifteen CEO Grants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized share-based compensation expense   $ 1.1
Stock Plan 1998 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period - ending   10 years
Number of shares authorized under plan (in shares)   3,600,000
Stock Plan 2000 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized under plan (in shares)   16,200,000
Additional shares authorized (in shares) 4,500,000  
Stock Plan 2012 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares authorized under plan (in shares)   2,000,000
Employee stock options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period - beginning   7 years
Expiration period - ending   10 years
Vesting period   4 years
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights (in shares)   1
Restricted Stock [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   3 years
Restricted Stock [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period   4 years
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized share-based compensation expense   $ 2.0
Performance Shares [Member] | Two Thousand Fifteen CEO Grants [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected grants to be achieved   156,023