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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, 2017
Mar. 31, 2016
Numerator for basic net income per common share [Abstract]    
Net income $ 22,701 $ 27,353
Preferred stock dividends (3,864) (3,826)
Earnings participation of unvested equity awards (40) (44)
Numerator for basic net income per common share $ 18,797 $ 23,483
Denominator for basic net income per common share [Abstract]    
Average number of shares of common stock outstanding (in shares) 96,061 95,913
Average unvested stock awards outstanding (in shares) (306) (299)
Denominator for basic net income per common share (in shares) 95,755 95,614
Basic net income per common share (in dollars per share) $ 0.20 $ 0.25
Numerator for diluted net income per common share [Abstract]    
Numerator for basic net income per common share $ 18,797 $ 23,483
Denominator for diluted net income per common share [Abstract]    
Denominator for basic net income per common share (in shares) 95,755 95,614
Net effect of dilutive equity awards (in shares) 120 131
Denominator for diluted net income per common share (in shares) 95,875 95,745
Diluted net income per common share (in dollars per share) $ 0.20 $ 0.25