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Stockholders' Equity (Details) (USD $)
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0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 9 Months Ended | |||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Apr. 30, 2014
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Jan. 29, 2014
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 11, 2014
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Dec. 31, 2013
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Jun. 03, 2014
New ATM program [Member]
Y
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Sep. 30, 2014
New ATM program [Member]
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Jun. 02, 2014
Atm Program [Member]
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Sep. 30, 2014
Quarter 4 2013 [Member]
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Sep. 30, 2014
Quarter 1 2014 [Member]
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Sep. 30, 2014
Quarter 2 2014 [Member]
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Sep. 30, 2014
Quarter 3 2014 [Member]
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Aug. 15, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
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May 15, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
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Feb. 18, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
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Sep. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
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Sep. 11, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
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Dec. 31, 2013
Series B Cumulative Redeemable Preferred Stock [Member]
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Sep. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 1 2014 [Member]
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Sep. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 2 2014 [Member]
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Sep. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 3 2014 [Member]
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Sep. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 4 2014 [Member]
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Mar. 27, 2018
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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Sep. 30, 2014
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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Mar. 27, 2018
Subsequent Event [Member]
Series B Cumulative Redeemable Preferred Stock [Member]
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| Class of Stock [Line Items] | ||||||||||||||||||||||||||
| Common stock, shares outstanding | 153,099,786 | 152,983,101 | ||||||||||||||||||||||||
| At the market stock offering program, aggregate value of common stock | $ 600,000,000 | $ 600,000,000 | ||||||||||||||||||||||||
| At Market Stock Offering Program Maximum Length Of Sale In Years | 3 | |||||||||||||||||||||||||
| 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 | 70,422 | |||||||||||||||||||||||||
| Shares of Common Stock upon the exercise of options to purchase Common Stock by certain employees (in shares) | 17,124 | |||||||||||||||||||||||||
| Dividend payable date | Jan. 29, 2014 | Apr. 30, 2014 | Jul. 31, 2014 | Oct. 31, 2014 | Feb. 18, 2014 | May 15, 2014 | Aug. 15, 2014 | Nov. 17, 2014 | ||||||||||||||||||
| Dividend paid on common stock (in dollars per share) | $ 0.65 | $ 2.90 | $ 32.8125 | $ 32.8125 | $ 32.8125 | |||||||||||||||||||||
| Dividend shareholder of record date | Dec. 31, 2013 | Mar. 31, 2014 | Jun. 30, 2014 | Sep. 30, 2014 | Nov. 05, 2014 | |||||||||||||||||||||
| Dividends payable, date declared | Sep. 11, 2014 | Sep. 11, 2014 | ||||||||||||||||||||||||
| Dividends Payable, Amount Per Share | $ 0.65 | $ 32.8125 | ||||||||||||||||||||||||
| Series B, Shares Outstanding | 80,000 | 80,000 | 8,000,000 | |||||||||||||||||||||||
| Series B, Dividend Rate, Percentage | 5.25% | |||||||||||||||||||||||||
| Series B, Liquidation Preference Per Share | $ 2,500.00 | $ 2,500 | $ 25.00 | $ 25.00 | $ 2,500.00 | |||||||||||||||||||||
| Proceeds from Issuance of Series B | 0 | 193,623,000 | ||||||||||||||||||||||||
| Ratio of depository shares to shares of Series B Preferred Stock | 0.01 | |||||||||||||||||||||||||
| Common Stock, Value, Issued | $ 1,531,000 | $ 1,530,000 | $ 0 | |||||||||||||||||||||||