Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE (Details)

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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Basic:        
Net income - basic $ 95,150 $ 18,235 $ 296,559 $ 278,626
Net income - basic (in shares) 173,057,538 182,957,416 175,776,312 178,736,569
Net income - basic (in usd per share) $ 0.55 $ 0.10 $ 1.69 $ 1.56
Effect of dilutive securities:        
Stock options and awards $ 0 $ 0 $ 0 $ 0
Stock options and awards (in shares) 247,376 51,020 664,149 394,001
Diluted:        
Net income - diluted $ 95,150 $ 18,235 $ 296,559 $ 278,626
Net income - diluted (in shares) 173,304,914 183,008,436 176,440,461 179,130,570
Net income - diluted (in usd per share) $ 0.55 $ 0.10 $ 1.68 $ 1.56