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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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Aggregate dividends declared during the period for each share of common stock outstanding.

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