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Equity (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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 | 40,534 |  |
Common stock shares issued through dividend reinvestment plan | 2,272 | 3,058 | 2,396
Number of shares of stock grants withheld | 68,565 | 60,319 | 53,453
Common shares issued under Employee Stock Purchase Plan | 12,955 |  |
Number of shares forfeited | 4,860 |  |
Issuance of common stock, net | $ 52,261,000 | $ 111,093,000 | $ 15,526,000
Continuous Equity Program CEP IV |  |  |
Class of Stock [Line Items] |  |  |
Issuance of common stock, net of withholdings (in shares) | 244,924 |  |
Maximum value of shares of common stock that can be sold | $ 1,000,000,000 |  |
Percentage of compensation received by sales agent | 2.00% |  |
Shares issued, weighted average price per share (in dollars per share) | $ 189.14 |  |
Issuance of common stock, net | $ 45,629,000 |  |
Common stock value, remaining to be authorized under continuous equity program | $ 846,591,000 |  |
Maximum [Member] | 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] |  |  |
Common stock shares issued in connection with stock grants | 187,010 | 201,824 | 197,018

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