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Dividends (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jan. 15, 2013 Subsequent Event [Member] | Dec. 31, 2012 Series C Depositary Share [Member] | Dec. 31, 2011 Series C Depositary Share [Member] | Dec. 31, 2010 Series C Depositary Share [Member] | Dec. 31, 2012 Series D Depositary Share [Member] | Dec. 31, 2011 Series D Depositary Share [Member] | Dec. 31, 2010 Series D Depositary Share [Member] | Feb. 28, 2013 Series D Depositary Share [Member] Subsequent Event [Member] | Dec. 31, 2012 Ordinary dividends [Member] | Dec. 31, 2011 Ordinary dividends [Member] | Dec. 31, 2010 Ordinary dividends [Member] | Dec. 31, 2012 Ordinary dividends [Member] Series C Depositary Share [Member] | Dec. 31, 2011 Ordinary dividends [Member] Series C Depositary Share [Member] | Dec. 31, 2010 Ordinary dividends [Member] Series C Depositary Share [Member] | Dec. 31, 2012 Ordinary dividends [Member] Series D Depositary Share [Member] | Dec. 31, 2012 Qualified dividends [Member] | Dec. 31, 2011 Qualified dividends [Member] | Dec. 31, 2010 Qualified dividends [Member] | Dec. 31, 2012 Qualified dividends [Member] Series C Depositary Share [Member] | Dec. 31, 2011 Qualified dividends [Member] Series C Depositary Share [Member] | Dec. 31, 2010 Qualified dividends [Member] Series C Depositary Share [Member] | Dec. 31, 2012 Qualified dividends [Member] Series D Depositary Share [Member] | Dec. 31, 2012 Capital gain [Member] | Dec. 31, 2011 Capital gain [Member] | Dec. 31, 2010 Capital gain [Member] | Dec. 31, 2012 Capital gain [Member] Series C Depositary Share [Member] | Dec. 31, 2011 Capital gain [Member] Series C Depositary Share [Member] | Dec. 31, 2010 Capital gain [Member] Series C Depositary Share [Member] | Dec. 31, 2012 Capital gain [Member] Series D Depositary Share [Member] | Dec. 31, 2012 Unrecaptured Section 1250 Gain [Member] | Dec. 31, 2011 Unrecaptured Section 1250 Gain [Member] | Dec. 31, 2010 Unrecaptured Section 1250 Gain [Member] | Dec. 31, 2012 Unrecaptured Section 1250 Gain [Member] Series C Depositary Share [Member] | Dec. 31, 2011 Unrecaptured Section 1250 Gain [Member] Series C Depositary Share [Member] | Dec. 31, 2010 Unrecaptured Section 1250 Gain [Member] Series C Depositary Share [Member] | Dec. 31, 2012 Unrecaptured Section 1250 Gain [Member] Series D Depositary Share [Member] | Dec. 31, 2012 Nontaxable distributions [Member] | Dec. 31, 2011 Nontaxable distributions [Member] | Dec. 31, 2010 Nontaxable distributions [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of common stock dividends, per share | $ 1.560000 | $ 1.530000 | $ 1.510000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.199003 | $ 1.088228 | $ 1.072446 |  |  |  |  | $ 0.013346 | $ 0.000000 | $ 0.081661 |  |  |  |  | $ 0.021358 | $ 0.000000 | $ 0.000861 |  |  |  |  | $ 0.048890 | $ 0.000000 | $ 0.000498 |  |  |  |  | $ 0.277403 | $ 0.441772 | $ 0.354534
Payment of common stock dividends, declared and paid | $ 167,495,000 | $ 133,720,000 | $ 125,391,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, per share | $ 1.56 | $ 1.53 | $ 1.51 | $ 0.395 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of preferred stock dividends, per share |  |  |  |  | $ 0.537760 | [1] | $ 1.843750 | [1] | $ 1.843750 | [1] | $ 1.343403 | [2] | $ 0.0000 | [2] | $ 0.0000 | [2] |  |  |  |  | $ 0.502710 | $ 1.843750 | $ 1.703170 | $ 1.255844 |  |  |  | $ 0.005596 | $ 0.000000 | $ 0.140580 | $ 0.013979 |  |  |  | $ 0.008956 | $ 0.000000 | $ 0.000000 | $ 0.022371 |  |  |  | $ 0.020498 | $ 0.000000 | $ 0.000000 | $ 0.051209 |  |  |
Series C preferred stock dividends, declared and paid |  | $ 6,785,000 | $ 6,785,000 |  | $ 1,979,000 | [1] | $ 6,785,000 | [1] | $ 6,785,000 | [1] | $ 15,449,000 | [2] | $ 0 | [2] | $ 0 | [2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series D preferred stock, per share |  | $ 1.84375 | $ 1.84375 |  |  |  |  |  |  |  | $ 1.34340 |  |  |  |  |  | $ 41.40625 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | 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.
[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.

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