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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator:        
Net income (loss) $ 60,049 $ (60,466) $ 145,004 $ 78,786
Denominator (shares in 000's):        
Basic weighted average shares outstanding (in shares) 66,477,000 73,754,000 68,081,000 74,999,000
Effect of dilutive securities - Stock options and awards (in shares) 705,000 0 703,000 765,000
Diluted weighted average shares outstanding (in shares) 67,182,000 73,754,000 68,784,000 75,764,000
Earnings (loss) per share        
Basic earnings (loss) per share (in dollars per share) $ 0.90 $ (0.82) $ 2.13 $ 1.05
Diluted earnings (loss) per share (in dollars per share) $ 0.89 $ (0.82) $ 2.11 $ 1.04
Anti-dilutive shares excluded from the computation of diluted earnings per share 803,741 1,279,664 807,763 508,070