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Stockholders' Equity:Shares and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 06, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Common stock, authorized |  | 300,000,000 |  |  |  | 300,000,000 | 300,000,000 | 300,000,000 |
Common stock, issued |  | 44,075,840 |  |  |  | 43,747,805 | 44,075,840 | 43,747,805 |
Common stock, outstanding |  | 38,708,767 |  |  |  | 38,580,732 | 38,708,767 | 38,580,732 |
Common Stock, Dividends, Per Share, Additional Declared |  |  | $ 1.00 |  |  |  |  |  |
Common Stock, Dividends, Per Share, Additional Paid |  |  | 1.00 |  |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  | $ 0.09 | 0.07 | $ 0.07 | $ 0.07 | $ 0.07 |  |  |
Dividends paid on common stock |  |  |  |  |  |  | $ (50,615) | $ (2,701) | $ 0
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.09 | $ 0.07 | $ 0.07 | $ 0.07 | $ 0.07 | $ 1.30 | $ 0.07 | $ 0.00
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |
Preferred stock, authorized |  | 50,000,000 |  |  |  | 50,000,000 | 50,000,000 | 50,000,000 |
Preferred stock, shares Issued |  | 0 |  |  |  | 0 | 0 | 0 |
Preferred stock, outstanding |  | 0 |  |  |  | 0 | 0 | 0 |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Mar. 01, 2019 |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Feb. 06, 2019 |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Mar. 15, 2019 |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.09 |  |  |  |  |  |  |  |

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