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STOCKHOLDERS' EQUITY (Employee Stock Purchase Plan and Common Stock Repurchase Program) (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
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%    
Share Based Compensation, Arrangement by Share Based Payment Award, Offering Period 6 months    
Authorized amount under stock repurchase program $ 1,000,000,000    
Remaining authorized amount available for stock repurchase $ 197,100,000    
Repurchase of common stock (in shares) 1.4 16.3 12.2
Average price of shares repurchased (in dollars per share) $ 8.27 $ 8.01 $ 7.20
Repurchase of common stock $ (11,984,000) $ (130,383,000) $ (87,781,000)
Common Stock, Dividends, Per Share, Cash Paid $ 0.12 $ 0 $ 0
Dividends, Common Stock, Cash $ 50,238,000    
Employee Stock [Member]      
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) $ 1.50 $ 1.66 $ 1.49
Cash proceeds from the issuance of shares $ 11,100,000 $ 11,200,000 $ 10,600,000
Employee Stock Purchase Plan 2010 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of employee's eligible compensation as limitation on purchases 10.00%    
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount $ 25,000    
Shares purchased 1.6 1.7 1.9
Average purchase price per share $ 6.79 $ 6.59 $ 5.52
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 25.0    
Number of shares available for issuances 17.3