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Equity (Details 2) (USD $) | 6 Months Ended |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Aug. 31, 2012 CEP III | Jun. 30, 2014 CEP III
Class of Stock [Line Items] |  |  |  |  |
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 | 224,771 |  |  |  |
Common stock shares issued through dividend reinvestment plan | 1,286 | 1,030 |  |  |
Common stock shares issued in connection with stock grants | 113,822 | 123,977 |  |  |
Common shares through the Employee Stock Purchase Program | 4,367 |  |  |  |
Number of shares of stock grants withheld | 50,105 | 44,222 |  |  |
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 |  |  |  |  | 1,418,959
Average sales price (in usd per share) |  |  |  |  | $ 140.94
Issuance of common stock | 214,970,000 | 2,605,000 |  |  | 196,984,000
Value of additional shares authorized for issuance |  |  |  |  | $ 446,286,000

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