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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)
9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
8.25% Series A cumulative redeemable preferred stock
     
Preferred stock, dividend rate (as a percent) 8.25% 8.25% 8.25%
7.75% Series B cumulative redeemable preferred stock
     
Preferred stock, dividend rate (as a percent) 7.75% 7.75% 7.75%
8.50% Series C preferred stock
     
Preferred stock, dividend rate (as a percent) 8.50%