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Capital Stock, Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 03, 2021 | Sep. 08, 2021 | Jun. 09, 2021 | Mar. 10, 2021 | Aug. 31, 2021 | May 31, 2021 | Feb. 28, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Payment of cash dividends |  |  |  |  |  |  |  | $ 57,336 | $ 59,287
Dividend Declared 2021-Q1 [Member] |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2021-02 |
Dividend payable per share (in dollars per share) |  |  |  |  |  |  | $ 0.38 |  |
Payment of cash dividends |  |  |  | $ 19,300 |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  | Mar. 10, 2021 |
Dividend payable, date of record |  |  |  |  |  |  |  | Feb. 26, 2021 |
Dividend Declared 2021-Q2 [Member] |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2021-05 |
Dividend payable per share (in dollars per share) |  |  |  |  |  | $ 0.38 |  |  |
Payment of cash dividends |  |  | $ 19,000 |  |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  | Jun. 09, 2021 |
Dividend payable, date of record |  |  |  |  |  |  |  | May 28, 2021 |
Dividend Declared 2021-Q3 [Member] |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Dividend payable, date declared |  |  |  |  |  |  |  | 2021-08 |
Dividend payable per share (in dollars per share) |  |  |  |  | $ 0.38 |  |  |  |
Payment of cash dividends |  | $ 19,000 |  |  |  |  |  |  |
Dividend payable, date paid |  |  |  |  |  |  |  | Sep. 08, 2021 |
Dividend payable, date of record |  |  |  |  |  |  |  | Aug. 27, 2021 |
Dividend Declared 2021-Q4 [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Dividends per Share [Abstract] |  |  |  |  |  |  |  |  |
Dividend payable, date declared | 2021-11 |  |  |  |  |  |  |  |
Dividend payable per share (in dollars per share) | $ 0.38 |  |  |  |  |  |  |  |
Dividend payable, date paid | Dec. 08, 2021 |  |  |  |  |  |  |  |
Dividend payable, date of record | Nov. 26, 2021 |  |  |  |  |  |  |  |

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- Definition Date the declared dividend will be paid, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 + Details
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