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Equity (Details 2) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |
Common stock, shares authorized (in shares) | 280,000,000 |  | 280,000,000
Preferred stock, shares authorized (in shares) | 50,000,000 |  | 50,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | 5,263 |  |
Common stock issued through the dividend reinvestment plan (in shares) | 1,713 | 2,466 |
Number of shares of stock grants withheld (in shares) | 67,963 | 60,165 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 6,613 |  |
Stock issued during period, shares, share-based compensation, forfeited (in shares) | 4,622 |  |
Continuous Equity Program CEP IV |  |  |
Class of Stock [Line Items] |  |  |
Maximum value of shares of common stock that can be sold (in dollars) | $ 1,000,000,000 |  |
Common stock value, remaining to be authorized under continuous equity program | $ 892,915,000 |  |
Maximum | Continuous Equity Program CEP IV |  |  |
Class of Stock [Line Items] |  |  |
Percentage of compensation received by sales agent | 2.00% |  |
Restricted Stock and Restricted Stock Converted From Performance Shares |  |  |
Class of Stock [Line Items] |  |  |
Equity instruments granted (in shares) | 187,010 | 201,314 |

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