Stockholders' Equity (Details) (USD $)
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0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 0 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||||||||
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Apr. 30, 2014
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Jan. 29, 2014
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 19, 2014
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Dec. 31, 2013
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Jun. 03, 2014
New ATM program [Member]
Y
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Jun. 30, 2014
New ATM program [Member]
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Jun. 02, 2014
Atm Program [Member]
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Jun. 30, 2014
Quarter 4 2013 [Member]
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Jun. 30, 2014
Quarter 1 2014 [Member]
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Jun. 30, 2014
Quarter 2 2014 [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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Jun. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
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Jun. 19, 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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Jun. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 1 2014 [Member]
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Jun. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 2 2014 [Member]
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Jun. 30, 2014
Series B Cumulative Redeemable Preferred Stock [Member]
Quarter 3 2014 [Member]
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Mar. 27, 2018
Depository shares of Series B Cumulative Redeemable Preferred [Member]
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Jun. 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 | 153,092,574 | 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 | 66,612 | ||||||||||||||||||||||
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 | Feb. 18, 2014 | May 15, 2014 | Aug. 15, 2014 | |||||||||||||||||
Dividend paid on common stock (in dollars per share) | $ 0.65 | $ 2.90 | $ 32.8125 | $ 32.8125 | |||||||||||||||||||
Dividend shareholder of record date | Dec. 31, 2013 | Mar. 31, 2014 | Jun. 30, 2014 | Aug. 05, 2014 | |||||||||||||||||||
Dividends payable, date declared | Jun. 19, 2014 | Jun. 19, 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 | 193,920,000 | |||||||||||||||||||||
Ratio of depository shares to shares of Series B Preferred Stock | 0.01 | ||||||||||||||||||||||
Common Stock, Value, Issued | $ 1,531,000 | $ 1,530,000 | $ 0 |