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Stockholders' Equity:Shares and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended						9 Months Ended
	Oct. 30, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Supplemental dividends paid per common share					$ 1.00
Dividends paid on common stock								$ 11,070	$ 47,113
Common Stock, Dividends, Per Share, Cash Paid		$ 0.09	$ 0.09	$ 0.09	0.07	$ 0.07	$ 0.07
Dividends declared per common share, excluding supplemental dividends					0.07
Subsequent Event [Line Items]
Dividends declared per common share		$ 0.09	$ 0.09	$ 0.09	1.07	$ 0.07	$ 0.07	$ 0.27	$ 1.21
Supplemental dividends declared per common share					$ 1.00
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends Payable, Date Declared	Oct. 30, 2019
Dividends declared per common share	$ 0.10
Supplemental dividends declared per common share	$ 1.00
Dividends Payable, Date to be Paid	Dec. 16, 2019
Dividends Payable, Date of Record	Dec. 02, 2019

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