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Stockholders' Equity:Shares and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended				9 Months Ended
	Nov. 02, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]
Common Stock, Dividends, Per Share, Cash Paid		$ 0.07	$ 0.07	$ 0.07
Common Stock, additional dividend, per share		1.00
Dividends paid on common stock						$ 47,113	$ 0
Dividends declared per common share	$ 0.09	$ 1.07			$ 0.00	$ 1.21	$ 0.00

X

- Definition

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

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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- Definition

Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585

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