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Equity (Details 2) (USD $) | 3 Months Ended |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 | Aug. 31, 2012 CEP III | Mar. 31, 2014 CEP III
Equity |  |  |  |  |
Common stock, shares authorized | 280,000,000 |  | 280,000,000 |  |
Preferred stock, shares authorized | 50,000,000 |  | 50,000,000 |  |
Common stock shares issued in connection with stock options exercised | 84,836 |  |  |  |
Common stock shares issued through dividend reinvestment plan | 638 | 550 |  |  |
Common stock shares issued in connection with stock grants | 104,060 | 119,292 |  |  |
Number of shares of stock grants withheld | 33,365 | 29,219 |  |  |
Maximum value of shares of common stock that can be sold (in dollars) |  |  |  | $ 750,000,000 |
Period during which common stock can be sold |  |  |  | 36 months |
Percentage of compensation received by sales agent |  |  |  |  | 1.50%
Common stock shares issued |  |  |  |  | 0
Value of additional shares authorized for issuance |  |  |  |  | $ 646,274,000

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