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Equity (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | 131,499 |  |
Common stock shares issued through dividend reinvestment plan | 2,396 | 2,142 | 2,434
Number of shares of stock grants withheld | 53,453 | 45,090 | 55,523
Common shares issued under Employee Stock Purchase Plan | 11,348 |  |
Number of shares forfeited | 4,262 |  |
Continuous Equity Program CEP IV [Member] |  |  |
Class of Stock [Line Items] |  |  |
Maximum value of shares of common stock that can be sold | $ 1,000,000,000 |  |
Percentage of compensation received by sales agent | 2.00% |  |
Stock Issued During Period, Shares, New Issues | 0 |  |
Maximum [Member] | Continuous Equity Program CEP IV [Member] |  |  |
Class of Stock [Line Items] |  |  |
Percentage of compensation received by sales agent | 2.00% |  |
Restricted Stock Converted From Performance Shares [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares issued in connection with stock grants | 197,018 | 157,779 | 115,163
Non Employee Director [Member] | Deferred Compensation, Share-based Payments [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares issued in connection with stock grants | 44,327 | 46,589 |

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