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Stockholders' Equity Stockholders' Equity:Shares and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Aug. 02, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018 | Jun. 30, 2017
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |
Common stock dividends, per share | $ 0.07 | $ 0.07 | $ 0.07 |  | $ 0
Common Stock, additional dividend, per share | $ 1.00 |  |  |  |
Dividends paid on common stock |  |  |  | $ 5,481 | $ 0

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- Definition Additional aggregate dividends declared during the period for each share of common stock outstanding. + References No definition available. + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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