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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Numerator:        
Net income $ 70,898 $ 77,332 $ 139,252 $ 133,785
Denominator:        
Basic weighted average shares outstanding (in shares) 75,000,000 79,873,000 75,621,000 80,260,000
Effect of dilutive securities - Stock options and awards (in shares) 773,000 900,000 795,000 934,000
Diluted weighted average shares outstanding (in shares) 75,773,000 80,773,000 76,416,000 81,194,000
Earnings (loss) per share        
Basic earnings per share (in dollars per share) $ 0.95 $ 0.97 $ 1.84 $ 1.67
Diluted earnings per share (in dollars per share) $ 0.94 $ 0.96 $ 1.82 $ 1.65
Anti-dilutive shares excluded from the computation of diluted earnings per share 556,371 261,725 481,831 263,363