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STOCKHOLDERS’ EQUITY - Performance-Based Restricted Stock Units and Employee Stock Purchase Plan (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 12,537,000 $ 15,278,000 $ 26,224,000 $ 30,895,000
Purchase price of the entity's common stock expressed as percentage of fair market value at the commencement or end of the offering period 85.00%   85.00%  
Share Based Compensation, Arrangement by Share Based Payment Award, Offering Period     6 months  
Performance-based Restricted Stock Unites (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred compensation arrangement with individual performance based shares granted percentage 100.00%      
Performance-based Restricted Stock Unites (RSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred compensation arrangement with individual performance based shares granted percentage 200.00%      
Employee Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average fair value of the rights to purchase shares (in dollars per share) $ 1.68 $ 1.64 $ 1.68 $ 1.64
Cash proceeds from the issuance of shares     $ 5,294,000 $ 5,400,000
2015 Long-term Performance-based Incentive Plan | Performance-based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units issued (2,647)      
2015 Long-term Performance-based Incentive Plan | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 200,000   1,500,000  
2014 Long-term Performance-based Incentive Plan | Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 300,000 $ 900,000 $ 1,400,000 $ 2,000,000
Employee Stock Purchase Plan 2010        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of employee's eligible compensation as limitation on purchases 10.00%   10.00%  
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount $ 25,000      
Shares purchased 800   800  
Average purchase price per share     $ 6.97 $ 6.43
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 25,000   25,000  
Number of shares available for issuances 18,200   18,200