Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v2.4.0.8
Consolidated Balance Sheets (Parenthetical) (USD $)
 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Series B Cumulative Redeemable Preferred Stock
Dec. 31, 2012
Series B Cumulative Redeemable Preferred Stock
Jun. 30, 2013
Series C Cumulative Redeemable Preferred Stock
Dec. 31, 2012
Series C Cumulative Redeemable Preferred Stock
Jun. 30, 2013
Series D Cumulative Redemable Preferred Stock
Dec. 31, 2012
Series D Cumulative Redemable Preferred Stock
Preferred stock, dividend rate     9.75% 9.75% 8.05% 8.05% 8.375% 8.375%
Preferred stock, par value $ 0.01 $ 0.01            
Preferred stock, shares authorized 100,000,000 100,000,000            
Preferred stock, shares issued 2,463,321 2,463,321 1,347,321 1,347,321 496,000 496,000 620,000 620,000
Preferred stock, shares outstanding 2,463,321 2,463,321 1,347,321 1,347,321 496,000 496,000 620,000 620,000
Preferred stock liquidation preference, per share $ 25.00 $ 25.00            
Common stock, par value $ 0.01 $ 0.01            
Common stock, shares authorized 1,000,000,000 500,000,000            
Common stock, shares issued 293,326,085 172,525,645            
Common stock, shares outstanding 293,326,085 172,525,645