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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
Mar. 31, 2018
Mar. 31, 2017
Numerator for basic net income per common share [Abstract]    
Net income $ 19,420 $ 22,701
Preferred stock dividends (4,842) (3,864)
Earnings participation of unvested equity awards (32) (40)
Numerator for basic net income per common share $ 14,546 $ 18,797
Denominator for basic net income per common share [Abstract]    
Average number of shares of common stock outstanding (in shares) 93,867 96,061
Average unvested stock awards outstanding (in shares) (442) (306)
Denominator for basic net income per common share (in shares) 93,425 95,755
Basic net income per common share (in dollars per share) $ 0.16 $ 0.20
Numerator for diluted net income per common share [Abstract]    
Numerator for basic net income per common share $ 14,546 $ 18,797
Denominator for diluted net income per common share [Abstract]    
Denominator for basic net income per common share (in shares) 93,425 95,755
Net effect of dilutive equity awards (in shares) 81 120
Denominator for diluted net income per common share (in shares) 93,506 95,875
Diluted net income per common share (in dollars per share) $ 0.16 $ 0.20