Tax Treatment of Distributions (Details 1) - $ / shares
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1 Months Ended |
3 Months Ended |
12 Months Ended |
Aug. 31, 2012 |
Mar. 31, 2012 |
Dec. 31, 2012 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Income Tax Treatment of Dividends Paid [Line Items] |
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| Capital gains, federal statutory tax rate |
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20.00%
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25.00%
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| Common Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Dividends paid per common share |
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$ 1.400
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$ 1.400
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$ 1.400
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$ 1.400
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| Common Stock, Dividends, Per Share, Cash Paid, Percentage |
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100.00%
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100.00%
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100.00%
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| Series G Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred stock, dividend rate |
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6.875%
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6.875%
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6.875%
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 1.719
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$ 1.719
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$ 1.719
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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100.00%
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100.00%
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100.00%
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| Series H Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred stock, dividend rate |
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6.375%
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6.375%
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6.375%
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 1.594
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$ 1.594
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$ 1.594
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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100.00%
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100.00%
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100.00%
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| Series E Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.000
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$ 0.000
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$ 0.818
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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0.00%
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100.00%
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| Series F Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.000
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$ 0.000
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$ 0.786
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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0.00%
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100.00%
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| Tax Treatment, Ordinary Income | Common Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Dividends paid per common share |
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$ 0.992
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$ 0.998
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$ 0.756
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| Common Stock, Dividends, Per Share, Cash Paid, Percentage |
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70.86%
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71.29%
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54.00%
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| Tax Treatment, Ordinary Income | Series G Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 1.218
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$ 1.711
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$ 1.668
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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70.86%
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99.54%
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97.03%
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| Tax Treatment, Ordinary Income | Series H Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 1.129
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$ 1.587
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$ 1.546
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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70.86%
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99.56%
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96.99%
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| Tax Treatment, Ordinary Income | Series E Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.000
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$ 0.000
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$ 0.818
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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0.00%
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100.00%
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| Tax Treatment, Ordinary Income | Series F Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.000
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$ 0.000
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$ 0.786
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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0.00%
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100.00%
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| Tax Treatment, Qualified Dividend | Common Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Dividends paid per common share |
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$ 0.002
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$ 0.002
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$ 0.003
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| Common Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.13%
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0.14%
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0.21%
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| Tax Treatment, Qualified Dividend | Series G Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.002
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$ 0.003
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$ 0.006
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.13%
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0.17%
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0.35%
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| Tax Treatment, Qualified Dividend | Series H Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.002
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$ 0.003
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$ 0.006
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.13%
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0.19%
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0.38%
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| Tax Treatment, Return of Capital | Common Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Dividends paid per common share |
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$ 0.000
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$ 0.398
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$ 0.620
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| Common Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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28.43%
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44.29%
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| Tax Treatment, Capital Gains | Common Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Dividends paid per common share |
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$ 0.051
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$ 0.002
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[1] |
$ 0.000
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[1] |
| Common Stock, Dividends, Per Share, Cash Paid, Percentage |
[1] |
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3.65%
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0.14%
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0.00%
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| Tax Treatment, Capital Gains | Series G Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.063
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$ 0.005
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[2] |
$ 0.000
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[2] |
| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
[2] |
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3.65%
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0.29%
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0.00%
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| Tax Treatment, Capital Gains | Series H Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.059
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$ 0.004
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$ 0.000
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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3.65%
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[2] |
0.25%
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0.00%
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| Tax Treatment, Capital Gains | Series E Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.000
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$ 0.000
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$ 0.000
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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0.00%
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0.00%
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| Tax Treatment, Capital Gains | Series F Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.000
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$ 0.000
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$ 0.000
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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0.00%
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0.00%
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| Tax Treatment, Unrecaptured Section 1250 Gains | Common Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Dividends paid per common share |
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$ 0.355
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$ 0.000
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$ 0.021
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| Common Stock, Dividends, Per Share, Cash Paid, Percentage |
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25.36%
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0.00%
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1.50%
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| Tax Treatment, Unrecaptured Section 1250 Gains | Series G Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.436
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$ 0.000
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$ 0.045
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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25.36%
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0.00%
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2.62%
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| Tax Treatment, Unrecaptured Section 1250 Gains | Series H Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.404
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$ 0.000
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$ 0.042
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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25.36%
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0.00%
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2.63%
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| Tax Treatment, Unrecaptured Section 1250 Gains | Series E Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.000
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$ 0.000
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$ 0.000
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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0.00%
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0.00%
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| Tax Treatment, Unrecaptured Section 1250 Gains | Series F Cumulative Redeemable Preferred Stock |
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| Income Tax Treatment of Dividends Paid [Line Items] |
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| Preferred Stock, Dividends, Per Share, Cash Paid |
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$ 0.000
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$ 0.000
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$ 0.000
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| Preferred Stock, Dividends, Per Share, Cash Paid, Percentage |
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0.00%
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0.00%
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0.00%
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