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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%

X

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

Name:	us-gaap_PreferredStockDividendRatePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration