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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator for basic net income per common share [Abstract]        
Net income $ 8,680 $ 16,752 $ 41,088 $ 57,002
Preferred stock dividends (4,842) (4,718) (14,526) (12,600)
Earnings participation of unvested equity awards (24) (36) (84) (116)
Numerator for basic net income per common share $ 3,814 $ 11,998 $ 26,478 $ 44,286
Denominator for basic net income per common share [Abstract]        
Average number of shares of common stock outstanding (in shares) 91,659 96,094 92,649 96,073
Average unvested stock awards outstanding (in shares) (453) (302) (447) (305)
Denominator for basic net income per common share (in shares) 91,206 95,792 92,202 95,768
Basic net income per common share (in dollars per share) $ 0.04 $ 0.13 $ 0.29 $ 0.46
Numerator for diluted net income per common share [Abstract]        
Numerator for basic net income per common share $ 3,814 $ 11,998 $ 26,478 $ 44,286
Denominator for diluted net income per common share [Abstract]        
Denominator for basic net income per common share (in shares) 91,206 95,792 92,202 95,768
Net effect of dilutive equity awards (in shares) 140 131 115 137
Denominator for diluted net income per common share (in shares) 91,346 95,923 92,317 95,905
Diluted net income per common share (in dollars per share) $ 0.04 $ 0.13 $ 0.29 $ 0.46