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Equity (Details 2) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
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
Common stock shares issued in connection with stock options exercised (in shares) | 41,123 |  |
Common stock issued through the dividend reinvestment plan (in shares) | 2,466 | 1,689 |
Number of shares of stock grants withheld (in shares) | 60,165 | 53,214 |
Stock issued during period, shares, employee stock purchase plans | 5,872 |  |
Stock issued during period, shares, share-based compensation, forfeited (in shares) | 3,045 |  |
Issuance of common stock, net | $ 110,117,000 | $ 14,147,000 |
Continuous Equity Program CEP IV |  |  |
Class of Stock [Line Items] |  |  |
Common stock shares issued | 568,424 |  |
Maximum value of shares of common stock that can be sold (in dollars) | $ 1,000,000,000 |  |
Shares issued, average price per share (in dollars per share) | $ 188.39 |  |
Issuance of common stock, net | $ 105,478,000 |  |
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) | 201,314 | 196,491 |

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