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SHAREHOLDERS' EQUITY (DETAILS 2) (Common Stock [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Treasury Shares [Line Items]    
Total shares 4,036,000 3,369,000
Total cost $ 178,703 $ 130,768
Average price per share $ 44.27 $ 38.81
Trident [Member]
    
Treasury Shares [Line Items]    
Total shares   3,000,000
In the Open Market [Member]
    
Treasury Shares [Line Items]    
Total shares 3,710,000 0
Total cost 164,606 0
Average price per share $ 44.37 $ 0.00
From Employees [Member]
    
Treasury Shares [Line Items]    
Total shares 326,000 369,000
Total cost 14,097 14,668
Average price per share $ 43.14 $ 39.74
From Founding Shareholder [Member]
    
Treasury Shares [Line Items]    
Total shares 0 3,000,000
Total cost $ 0 $ 116,100
Average price per share $ 0.00 $ 38.70