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Stockholders' Equity (Details) (USD $)
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0 Months Ended | 3 Months Ended | 3 Months Ended | 60 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 27, 2013
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Jan. 29, 2013
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Mar. 31, 2013
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Mar. 11, 2013
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Dec. 31, 2012
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Mar. 31, 2013
Atm Program [Member]
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Mar. 31, 2013
Quarter 4 2012 [Member]
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Mar. 31, 2013
Quarter 1 2013 [Member]
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Mar. 26, 2018
Series B Cumulative Redeemable Preferred Stock [Member]
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Mar. 27, 2018
Series B Cumulative Redeemable Preferred Stock [Member]
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Mar. 31, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
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Dec. 31, 2012
Series B Cumulative Redeemable Preferred Stock [Member]
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Mar. 27, 2018
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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Mar. 31, 2013
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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| Class of Stock [Line Items] | ||||||||||||||
| Common stock, shares outstanding | 151,639,524 | 151,601,209 | ||||||||||||
| At the market stock offering program, aggregate value of common stock | $ 600,000,000 | |||||||||||||
| At the market stock offering program remaining amount available for issuance | 305,300,000 | |||||||||||||
| Shares of its Common Stock in connection with the redemption of an equal number of OP Units | 8,762 | |||||||||||||
| Dividend payable date | Jan. 29, 2013 | Apr. 30, 2013 | ||||||||||||
| Dividend paid on common stock (in dollars per share) | $ 0.65 | |||||||||||||
| Dividend shareholder of record date | Dec. 31, 2012 | Mar. 29, 2013 | ||||||||||||
| Dividends payable, date declared | Mar. 11, 2013 | |||||||||||||
| Dividends payable, amount per share (in dollars per share) | $ 0.65 | |||||||||||||
| Series B, Shares Outstanding | 80,000 | 0 | 8,000,000 | |||||||||||
| Series B, Dividend Rate, Percentage | 5.25% | |||||||||||||
| Series B, Liquidation Preference Per Share | $ 2,500.00 | $ 2,500 | $ 0 | $ 25.00 | $ 25.00 | |||||||||
| Proceeds from Issuance of Series B | $ 194,000,000 | $ 194,371,000 | ||||||||||||
| Ratio of depository shares to shares of Series B Preferred Stock | 0.01 | |||||||||||||