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Stockholders' Equity:Shares and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended						9 Months Ended
	Oct. 29, 2020	Sep. 28, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Statement of Stockholders' Equity [Abstract]
Supplemental dividends declared per common share		$ 1.60
Dividends Payable			$ 62,722						$ 62,722		$ 0
Subsequent Event [Line Items]
Dividends Payable, Date Declared		Sep. 28, 2020
Dividends declared per common share			$ 1.70	$ 0.10	$ 0.10	$ 0.09	$ 0.09	$ 0.09	$ 1.90	$ 0.27
Dividends Payable, Date to be Paid		Nov. 02, 2020
Dividends Payable, Date of Record		Oct. 15, 2020
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared	Oct. 29, 2020
Dividends declared per common share	$ 0.10
Dividends Payable, Date to be Paid	Dec. 15, 2020
Dividends Payable, Date of Record	Dec. 01, 2020

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

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

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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