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Equity and Capital - Common Stock (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 03, 2021 $ / shares | Feb. 03, 2021 USD ($) | Sep. 30, 2021 USD ($) Agreement $ / shares shares | Jun. 30, 2021 $ / shares shares | May 31, 2021 $ / shares shares | Sep. 30, 2021 $ / shares shares | Sep. 30, 2020 $ / shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 USD ($) $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock dividend declared, per share | $ / shares |  |  |  |  |  | $ 0.595 | $ 0.595 | $ 1.785 | $ 1.785
Net proceeds from common stock issuance |  |  |  |  |  |  |  | $ 82,510 | $ 125,608
Common stock remaining available for Issuance | shares |  |  | 350,400,000 |  |  | 350,400,000 |  | 350,400,000 |
Stock Repurchase Program, Authorized Amount |  | $ 250,000 |  |  |  |  |  |  |
Stock Repurchase Program Expiration Date |  | Feb. 03, 2023 |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock dividend declared, per share | $ / shares | $ 0.625 |  |  |  |  |  |  |  |
Common stock, dividends payable date | Jan. 05, 2022 |  |  |  |  |  |  |  |
Common stock, dividends record date | Dec. 16, 2021 |  |  |  |  |  |  |  |
Common stock, dividends declared date | Nov. 03, 2021 |  |  |  |  |  |  |  |
Common Stock [Member] | AOCI Attributable to Parent |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  | $ 0 |
ATM Equity Offering Program [Member] | Forward Equity Offering [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Number of shares issuable | shares |  |  | 1,332,142 | 2,316,760 | 2,316,760 |  |  |  |
Sale of stock, average offering price | $ / shares |  |  | $ 63.71 | $ 64.59 | $ 64.59 | $ 63.71 |  | $ 63.71 |
Number of forward sale agreement settled | Agreement |  |  | 2 |  |  |  |  |  |
Underwriting discount and offering expense |  |  | $ 1,100 |  |  |  |  |  |
Settlement period |  |  |  |  |  |  |  | 1 year |
Proceeds from issuance of remaining shares of common stock |  |  |  |  |  |  |  | $ 64,000 |
Net proceeds from common stock issuance |  |  | $ 82,500 |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Equity Issuances, Common Shares Authorized for Issuance | shares |  |  | 500 |  |  | 500 |  | 500 |

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