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SHAREHOLDERS' EQUITY (DETAILS 2) (Common Stock [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2013
Trident [Member]
Sep. 30, 2014
In the Open Market [Member]
Sep. 30, 2013
In the Open Market [Member]
Sep. 30, 2014
In the Open Market [Member]
Sep. 30, 2013
In the Open Market [Member]
Sep. 30, 2014
From Employees [Member]
Sep. 30, 2013
From Employees [Member]
Sep. 30, 2014
From Employees [Member]
Sep. 30, 2013
From Employees [Member]
Sep. 30, 2014
From Founding Shareholder [Member]
Sep. 30, 2013
From Founding Shareholder [Member]
Sep. 30, 2014
From Founding Shareholder [Member]
Sep. 30, 2013
From Founding Shareholder [Member]
Treasury Shares [Line Items]                                  
Total shares 3,169,000 11,000 10,263,000 8,502,000 3,000,000 3,159,000 0 9,838,000 5,048,000 10,000 11,000 425,000 454,000 0 0 0 3,000,000
Total cost $ 150,449 $ 489 $ 468,532 $ 359,513   $ 150,000 $ 0 $ 450,000 $ 225,000 $ 449 $ 489 $ 18,532 $ 18,413 $ 0 $ 0 $ 0 $ 116,100
Average price per share $ 47.48 $ 44.12 $ 45.65 $ 42.29   $ 47.49 $ 0.00 $ 45.74 $ 44.57 $ 45.39 $ 44.12 $ 43.65 $ 40.56 $ 0.00 $ 0.00 $ 0.00 $ 38.70