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Equity (Details 2) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |
Common stock, shares authorized (in shares) | 280,000,000 | 280,000,000 |  | 280,000,000
Preferred stock, shares authorized (in shares) | 50,000,000 | 50,000,000 |  | 50,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period |  | 81,626 |  |
Common stock issued through the dividend reinvestment plan (in shares) |  | 1,594 | 1,713 |
Number of shares of stock grants withheld (in shares) |  | 83,602 | 67,963 |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 7,156 |  |
Stock issued during period, shares, share-based compensation, forfeited (in shares) |  | 1,730 |  |
Issuance of common stock, net |  | $ 207,789,000 | $ 1,224,000 |
Continuous Equity Programs CEP IV and CEP V [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 994,634 |  |
Continuous Equity Program CEP IV |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 755,054 |  |
Maximum value of shares of common stock that can be sold (in dollars) | $ 1,000,000,000 | $ 1,000,000,000 |  |
Shares Issued, Weighted Average Price Per Share |  | $ 198.26 |  |
Issuance of common stock, net | 0 | $ 147,450,000 |  |
Continuous Equity Program CEP V [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 239,580 |  |
Maximum value of shares of common stock that can be sold (in dollars) | 1,000,000,000 | $ 1,000,000,000 |  |
Shares Issued, Weighted Average Price Per Share |  | $ 208.70 |  |
Issuance of common stock, net |  | $ 49,250,000 |  |
Common stock value, remaining to be authorized under continuous equity program | $ 950,000,000 | $ 950,000,000 |  |
Forward Contract Indexed to Issuer's Equity, Shares |  | 947,868 |  |
Forward Contract Indexed to Issuer's Equity, Approximate Net Proceeds |  | $ 198,000,000 |  |
Maximum | Continuous Equity Program CEP IV |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percentage of compensation received by sales agent |  | 2.00% |  |
Maximum | Continuous Equity Program CEP V [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percentage of compensation received by sales agent |  | 1.50% |  |
Restricted Stock and Restricted Stock Converted From Performance Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Equity instruments granted (in shares) |  | 150,359 | 187,010 |
Deferred Compensation, Share-based Payments [Member] | Non Employee Director |  |  |  |
Class of Stock [Line Items] |  |  |  |
Equity instruments granted (in shares) |  | 1,838 |  |

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