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NET INCOME PER COMMON SHARE - Components of Computation of Basic and Diluted Net Income per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator for basic net income per common share [Abstract]        
Net income $ 12,988 $ 17,549 $ 32,408 $ 40,250
Preferred stock dividends (4,842) (4,018) (9,684) (7,882)
Earnings participation of unvested equity awards (28) (40) (60) (80)
Numerator for basic net income per common share $ 8,118 $ 13,491 $ 22,664 $ 32,288
Denominator for basic net income per common share [Abstract]        
Average number of shares of common stock outstanding (in shares) 92,447 96,063 93,153 96,062
Average unvested stock awards outstanding (in shares) (446) (307) (444) (307)
Denominator for basic net income per common share (in shares) 92,001 95,756 92,709 95,755
Basic net income per common share (in dollars per share) $ 0.09 $ 0.14 $ 0.24 $ 0.34
Numerator for diluted net income per common share [Abstract]        
Numerator for basic net income per common share $ 8,118 $ 13,491 $ 22,664 $ 32,288
Denominator for diluted net income per common share [Abstract]        
Denominator for basic net income per common share (in shares) 92,001 95,756 92,709 95,755
Net effect of dilutive equity awards (in shares) 120 160 101 140
Denominator for diluted net income per common share (in shares) 92,121 95,916 92,810 95,895
Diluted net income per common share (in dollars per share) $ 0.09 $ 0.14 $ 0.24 $ 0.34