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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net income $ 66,044 $ 64,765 $ 205,456 $ 195,327
Denominator:        
Basic weighted average shares outstanding (in shares) 81,644,000 82,918,000 82,260,000 83,233,000
Effect of dilutive securities - Stock options and awards (in shares) 1,063,000 998,000 1,054,000 1,093,000
Diluted weighted average shares outstanding (in shares) 82,707,000 83,916,000 83,314,000 84,326,000
Earnings (loss) per share        
Basic earnings per share (in dollars per share) $ 0.81 $ 0.78 $ 2.50 $ 2.35
Diluted earnings per share (in dollars per share) $ 0.80 $ 0.77 $ 2.47 $ 2.32
Anti-dilutive shares excluded from the computation of diluted earnings per share 44,026 461,093 420,584 46,678