NET INCOME PER COMMON SHARE - Potentially Dilutive Securities Excluded from Computation of Net Income Per Common Share (Details) (7.50% Cumulative Redeemable Preferred Stock, Series E [Member])	3 Months Ended
	Mar. 31, 2015
Schedule of Earning Per Share, Basic, by Common Class [Line Items]
Preferred stock dividend rate (in hundredths)	7.50%
Redeemable Preferred Stock [Member]
Schedule of Earning Per Share, Basic, by Common Class [Line Items]
Preferred stock dividend rate (in hundredths)	7.50%