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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 1 Months Ended | 9 Months Ended | 1 Months Ended
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Feb. 29, 2012 | Sep. 30, 2012 | Sep. 30, 2011 | Feb. 29, 2012 Series D Depositary Share [Member] | Sep. 30, 2012 Series D Depositary Share [Member] | Sep. 30, 2011 Series D Depositary Share [Member] | Sep. 30, 2012 Series D Depositary Share [Member] | Sep. 30, 2011 Series D Depositary Share [Member] | Dec. 31, 2011 Series D Depositary Share [Member] | Mar. 31, 2012 Series C Depositary Share [Member] | Sep. 30, 2012 Series C Depositary Share [Member] | Sep. 30, 2011 Series C Depositary Share [Member] | Sep. 30, 2012 Series C Depositary Share [Member] | Sep. 30, 2011 Series C Depositary Share [Member] | Dec. 31, 2011 Series C Depositary Share [Member] | Sep. 30, 2012 DRIP and ATM Equity Program [Member] | Sep. 30, 2011 DRIP and ATM Equity Program [Member] | May 31, 2012 ATM Equity Program [Member] | Sep. 30, 2012 ATM Equity Program [Member] | Oct. 31, 2012 Subsequent Event [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series C preferred stock dividends and Series D preferred stock dividends |  |  |  |  | $ 4,762 | $ 0 | $ 10,688 | [1] | $ 0 | [1] |  |  | $ 0 | $ 1,696 | $ 1,979 | [2] | $ 5,089 | [2] |  |  |  |  |  |
Series C preferred stock and Series D preferred stock, dividends per share (in dollars per share) |  |  |  |  |  |  | $ 0.9293 | [1] | $ 0 | [1] |  |  |  |  | $ 0.5378 | [2] | $ 1.3828 | [2] |  |  |  |  |  |
Payment of common stock dividends |  | 124,139 | 96,915 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends, per share, cash paid (in dollars per share) |  | $ 1.165 | $ 1.145 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends, per share, declared (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.395
Common stock, shares reserved for future issuance, dividend reinvestment plan (in shares) | 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 11,500,000 | 11,500,000 |  | 11,500,000 |  |  |  | 0 |  | 0 |  | 0 |  |  |  | 3,680,000 |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 6.625% |  |  |  |  |  |  |  | 7.375% |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, redemption price per share (in dollars per share) |  |  |  | $ 25 |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock |  | 287,500 | 0 | 277,645 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments of Stock Issuance Costs |  | 11,200 | 10,224 | 9,855 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,171 |  |
Stock redeemed or called during period (in shares) |  |  |  |  |  |  |  |  |  |  |  | 3,680,000 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, fixed annual dividend per share, depository shares (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  | $ 25.0768229 |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock redemption premium |  |  |  |  |  |  |  |  |  |  |  | 3,098 |  |  |  |  |  |  |  |  |  |  |  |
Shares available for issuance under at market offering program (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,000,000 |  |
At market offering equity program, period in force |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |
Stock Issued During Period, Shares, New Issues (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,251,798 |
Sale of Stock, Average Stock Price Per Share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29.05 |
Stock Issued During Period, Value, New Issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65,420 |
Stock issued during period, dividend reinvestment plan (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,994,113 | 2,423,611 |  |  |
Proceeds from issuance of common stock |  | $ 119,259 | $ 299,528 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,781 | $ 59,707 |  |  |
[1] | 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.
[2] | 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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