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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
EARNINGS PER SHARE          
Authorized common stock (in shares) 199,000,000   199,000,000   199,000,000
Common stock, par value (in dollars per share) $ 0.01   $ 0.01   $ 0.01
Diluted          
Income available to common shareholders (in dollars) $ 49,802 $ 41,686 $ 89,831 $ 85,495  
Shares of common stock 66,420,000 66,580,000 66,288,000 66,388,000  
Total average equivalent shares 68,106,000 68,758,000 68,339,000 68,940,000  
Net income per share, diluted (in dollars per share) $ 0.73 $ 0.61 $ 1.31 $ 1.24  
Basic          
Income available to common shareholders (in dollars) $ 49,802 $ 41,686 $ 89,831 $ 85,495  
Shares of common stock 66,420,000 66,580,000 66,288,000 66,388,000  
Net income per share, basic (in dollars per share) $ 0.75 $ 0.63 $ 1.36 $ 1.29  
Stock options
          
Diluted          
Effect of dilutive stock based compensation (in shares) 1,682,000 2,174,000 2,043,000 2,543,000  
Restricted stock
          
Diluted          
Effect of dilutive stock based compensation (in shares) 4,000 4,000 8,000 9,000