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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical)	6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
8.25% Series A preferred stock
Preferred stock, dividend rate (as a percent)	8.25%	8.25%	8.25%
7.75% Series B 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%	8.50%	8.50%

X

- Definition

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

+ References

No definition available.

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