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Dividends (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 15, 2014 Subsequent Event | Dec. 31, 2013 Series E Depositary Share | Dec. 31, 2012 Series E Depositary Share | Dec. 31, 2011 Series E Depositary Share | Feb. 28, 2014 Series E Depositary Share Subsequent Event | Dec. 31, 2013 Series D Depositary Share | Dec. 31, 2012 Series D Depositary Share | Dec. 31, 2011 Series D Depositary Share | Feb. 28, 2014 Series D Depositary Share Subsequent Event | Dec. 31, 2013 Series C Depositary Share | Dec. 31, 2012 Series C Depositary Share | Dec. 31, 2011 Series C Depositary Share | Dec. 31, 2013 Ordinary dividends | Dec. 31, 2012 Ordinary dividends | Dec. 31, 2011 Ordinary dividends | Dec. 31, 2013 Ordinary dividends Series E Depositary Share | Dec. 31, 2013 Ordinary dividends Series D Depositary Share | Dec. 31, 2012 Ordinary dividends Series D Depositary Share | Dec. 31, 2012 Ordinary dividends Series C Depositary Share | Dec. 31, 2011 Ordinary dividends Series C Depositary Share | Dec. 31, 2013 Qualified dividends | Dec. 31, 2012 Qualified dividends | Dec. 31, 2011 Qualified dividends | Dec. 31, 2013 Qualified dividends Series E Depositary Share | Dec. 31, 2013 Qualified dividends Series D Depositary Share | Dec. 31, 2012 Qualified dividends Series D Depositary Share | Dec. 31, 2012 Qualified dividends Series C Depositary Share | Dec. 31, 2011 Qualified dividends Series C Depositary Share | Dec. 31, 2013 Capital gain | Dec. 31, 2012 Capital gain | Dec. 31, 2011 Capital gain | Dec. 31, 2013 Capital gain Series E Depositary Share | Dec. 31, 2013 Capital gain Series D Depositary Share | Dec. 31, 2012 Capital gain Series D Depositary Share | Dec. 31, 2012 Capital gain Series C Depositary Share | Dec. 31, 2011 Capital gain Series C Depositary Share | Dec. 31, 2013 Unrecaptured Section 1250 Gain | Dec. 31, 2012 Unrecaptured Section 1250 Gain | Dec. 31, 2011 Unrecaptured Section 1250 Gain | Dec. 31, 2013 Unrecaptured Section 1250 Gain Series E Depositary Share | Dec. 31, 2013 Unrecaptured Section 1250 Gain Series D Depositary Share | Dec. 31, 2012 Unrecaptured Section 1250 Gain Series D Depositary Share | Dec. 31, 2012 Unrecaptured Section 1250 Gain Series C Depositary Share | Dec. 31, 2011 Unrecaptured Section 1250 Gain Series C Depositary Share | Dec. 31, 2013 Nontaxable distributions | Dec. 31, 2012 Nontaxable distributions | Dec. 31, 2011 Nontaxable distributions
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of common stock dividends, per share | $ 1.600000 | $ 1.560000 | $ 1.530000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.224568 | $ 1.199003 | $ 1.088228 |  |  |  |  |  | $ 0.056784 | $ 0.013346 | $ 0.000000 |  |  |  |  |  | $ 0.000000 | $ 0.021358 | $ 0.000000 |  |  |  |  |  | $ 0.000650 | $ 0.048890 | $ 0.000000 |  |  |  |  |  | $ 0.317998 | $ 0.277403 | $ 0.441772
Payment of common stock dividends, declared and paid | $ 189,107 | $ 167,495 | $ 133,720 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, per share | $ 1.60 | $ 1.56 | $ 1.53 | $ 0.405 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of preferred stock dividends, per share |  |  |  |  | $ 0.771875 | [1] | $ 0.000000 | [1] | $ 0.000000 | [1] |  | $ 1.656250 | [2] | $ 1.343403 | [2] | $ 0.0000 | [2] |  | $ 0.000000 | [3] | $ 0.537760 | [3] | $ 1.843750 | [3] |  |  |  | $ 0.741150 | $ 1.590323 | $ 1.255844 | $ 0.502710 | $ 1.843750 |  |  |  | $ 0.030332 | $ 0.065084 | $ 0.013979 | $ 0.005596 | $ 0.000000 |  |  |  | $ 0.000000 | $ 0.000000 | $ 0.022371 | $ 0.008956 | $ 0.000000 |  |  |  | $ 0.000393 | $ 0.000843 | $ 0.051209 | $ 0.020498 | $ 0.000000 |  |  |
Preferred stock dividends |  |  |  |  | $ 8,876 | [1] | $ 0 | [1] | $ 0 | [1] |  | $ 19,047 | [2] | $ 15,449 | [2] | $ 0 | [2] |  | $ 0 | [3] | $ 1,979 | [3] | $ 6,785 | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series D preferred stock, per share |  |  |  |  | $ 0.77188 |  |  |  |  |  | $ 35.62500 | $ 1.65625 |  | $ 1.34340 |  |  |  | $ 41.40625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The Series E Preferred Stock dividends paid during the quarter ended September 30, 2013 include accumulated and unpaid dividends from the issuance date through the declaration date.
[2] | The Series D Preferred Stock dividends paid during the quarter ended June 30, 2012 include accumulated and unpaid dividends from the issuance date through the declaration date. The Series D Preferred Stock has no maturity date and will remain outstanding unless redeemed.
[3] | The Series C Preferred Stock was redeemed in March 2012. The dividends paid during the quarter ended March 31, 2012 include accumulated and unpaid dividends through the redemption date.

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