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TREASURY STOCK (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 31, 2013
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Feb. 04, 2016
Treasury Stock [Line Items]                    
Reacquired shares, settlement of conversion spread hedges (in shares) 42,160                  
Reacquired shares, settlement of conversion spread hedges, value $ 43,100               $ (19)  
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)             65,849 77,761 113,503  
Repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation             $ 81,900 $ 103,100 $ 78,800  
Treasury stock, shares     9,888,024       12,427,945 9,888,024    
Repurchase Program (Q12016) [Member] | Subsequent Event                    
Treasury Stock [Line Items]                    
Stock repurchase program, authorized amount                   $ 3,000,000
Repurchase Program (Q12015) [Member]                    
Treasury Stock [Line Items]                    
Stock repurchase program, authorized amount   $ 3,000,000                
Repurchase of common stock, excluding repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)             2,468,259      
Repurchase of common stock, excluding repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation             $ 3,000,000      
Repurchase Program (Q22013) [Member]                    
Treasury Stock [Line Items]                    
Stock repurchase program, authorized amount           $ 1,000,000        
Repurchase of common stock, excluding repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)   5,813 438,897 114,645   431,910        
Repurchase of common stock, excluding repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation   $ 7,200 $ 500,000 $ 147,300   $ 345,500        
Repurchase Program (Q12010) [Member]                    
Treasury Stock [Line Items]                    
Repurchase of common stock, excluding repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation (in shares)         484,361          
Repurchase of common stock, excluding repurchase of common shares to satisfy employee withholding tax obligations related to stock-based compensation         $ 459,200