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Equity (Details 2) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jul. 31, 2020
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 | 2,126 |  |  |
Common stock issued through the dividend reinvestment plan (in shares) | 1,561 | 1,183 |  |
Number of shares of stock grants withheld (in shares) | 74,726 | 73,089 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans | 12,145 |  |  |
Stock issued during period, shares, share-based compensation, forfeited (in shares) | 709 |  |  |
Treasury Stock, Shares, Acquired | 0 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 316,148,000 |  |  |
Issuance of common stock, net | 2,372,000 | $ 1,613,000 |  |
2020 Stock Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 500,000,000
Amended 2005 Stock Repurchase Program [Member] |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 500,000,000
Continuous Equity Program CEP V [Member] |  |  |  |
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 | 752,878,000 |  |  |
Issuance of common stock, net | $ 0 |  |  |
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) | 151,186 | 164,526 |  |

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