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SHAREHOLDERS' EQUITY (DETAILS 3) - USD ($)
$ / shares in Units, $ in Thousands
 5 Months Ended 12 Months Ended
Jan. 15, 2016
Jan. 15, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Treasury Stock [Member]          
Class of Stock [Line Items]          
Total cost     $ 264,538 $ 543,202 $ 472,263
Additional paid-in capital [Member]          
Class of Stock [Line Items]          
Total cost     60,000 $ 0 $ 0
Accelerated Share Repurchase Agreement August 17 2015 [Member]          
Class of Stock [Line Items]          
Total cost     $ 300,000    
Total shares     4,149,378    
Accelerated Share Repurchases, initial repurchase percentage     80.00%    
Accelerated Share Repurchase Agreement August 17 2015 [Member] | Subsequent Event [Member]          
Class of Stock [Line Items]          
Total shares 1,358,380 5,507,758      
Average price per share   $ 54.47      
Accelerated Share Repurchase Agreement August 17 2015 [Member] | Treasury Stock [Member]          
Class of Stock [Line Items]          
Total cost     $ 240,000    
Accelerated Share Repurchase Agreement August 17 2015 [Member] | Additional paid-in capital [Member]          
Class of Stock [Line Items]          
Total cost     $ 60,000