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Stockholders' Equity:Shares and Dividends (Details) - $ / shares		3 Months Ended						9 Months Ended
	Oct. 28, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Subsequent Event [Line Items]
Dividends declared per common share		$ 0.10	$ 2.10	$ 0.10	$ 1.70	$ 0.10	$ 0.10	$ 2.30	$ 1.90
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared	Oct. 28, 2021
Dividends declared per common share	$ 0.12
Common Stock, Supplemental Dividends, Per Share, Declared	$ 3.00
Dividends Payable, Date to be Paid	Dec. 15, 2021
Dividends Payable, Date of Record	Dec. 01, 2021

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- Definition

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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-Topic 230
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-Section 50
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