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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
EARNINGS PER SHARE          
Authorized common stock (in shares) 199,000   199,000   199,000
Common stock, par value (in dollars per share) $ 0.01   $ 0.01   $ 0.01
Diluted          
Income available to common stockholders (in dollars) $ 57,539 $ 53,076 $ 102,710 $ 101,465  
Shares of common stock 62,697 65,328 62,496 65,397  
Total average equivalent shares 64,276 67,438 64,603 68,042  
Net income per share, diluted (in dollars per share) $ 0.90 $ 0.79 $ 1.59 $ 1.49  
Basic          
Income available to common stockholders (in dollars) $ 57,539 $ 53,076 $ 102,710 $ 101,465  
Shares of common stock 62,697 65,328 62,496 65,397  
Net income per share, basic (in dollars per share) $ 0.92 $ 0.81 $ 1.64 $ 1.55  
Stock options          
Diluted          
Effect of dilutive stock based compensation (in shares) 1,550 2,103 2,075 2,616  
Restricted stock units          
Diluted          
Effect of dilutive stock based compensation (in shares) 29 7 32 29