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NET INCOME (LOSS) PER COMMON SHARE - Components of Computation of Basic and Diluted Net Income (loss) per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator for basic net income (loss) per common share [Abstract]        
Net income (loss) $ (63,460) $ 12,988 $ (71,206) $ 32,408
Preferred stock dividends (4,842) (4,842) (9,684) (9,684)
Earnings participation of unvested equity awards (25) (28) (44) (60)
Numerator for basic net income (loss) per common share $ (68,327) $ 8,118 $ (80,934) $ 22,664
Denominator for basic net income (loss) per common share [Abstract]        
Average number of shares of common stock outstanding (in shares) 85,559 92,447 85,554 93,153
Average unvested stock awards outstanding (in shares) (625) (446) (640) (444)
Denominator for basic net income (loss) per common share (in shares) 84,934 92,001 84,914 92,709
Basic net income (loss) per common share (in dollars per share) $ (0.80) $ 0.09 $ (0.95) $ 0.24
Numerator for diluted net income (loss) per common share [Abstract]        
Numerator for basic net income (loss) per common share $ (68,327) $ 8,118 $ (80,934) $ 22,664
Denominator for diluted net income (loss) per common share [Abstract]        
Denominator for basic net income (loss) per common share (in shares) 84,934 92,001 84,914 92,709
Net effect of dilutive equity awards (in shares)   120   101
Denominator for diluted net income (loss) per common share (in shares) 84,934 92,121 84,914 92,810
Diluted net income (loss) per common share (in dollars per share) $ (0.80) $ 0.09 $ (0.95) $ 0.24