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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
Numerator:        
Net income $ 72,606 $ 66,319 $ 139,412 $ 130,562
Denominator:        
Basic weighted average shares outstanding (in shares) 82,419,000 83,328,000 82,569,000 83,390,000
Effect of dilutive securities - Stock options and awards (in shares) 992,000 1,120,000 1,037,000 1,137,000
Diluted weighted average shares outstanding (in shares) 83,411,000 84,448,000 83,606,000 84,527,000
Earnings (loss) per share        
Basic earnings per share (in dollars per share) $ 0.88 $ 0.80 $ 1.69 $ 1.57
Diluted earnings per share (in dollars per share) $ 0.87 $ 0.79 $ 1.67 $ 1.54
Anti-dilutive shares excluded from the computation of diluted earnings per share 418,407 45,188 420,770 43,211