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Stockholders' Equity:Shares and Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 12 Months Ended
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Feb. 05, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  | 300,000,000 |  |  |  |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  | 300,000,000 | 300,000,000 |
Common stock, shares issued |  | 44,568,299 |  |  |  |  |  |  | 44,352,778 |  |  |  |  |  |  |  |  |  |  |  | 44,568,299 | 44,352,778 |
Common stock, outstanding |  | 39,201,226 |  |  |  |  |  |  | 38,985,705 |  |  |  |  |  |  |  |  |  |  |  | 39,201,226 | 38,985,705 |
Dividends paid on common stock, per share |  | $ 0.10 |  | $ 1.70 | [1] | $ 0.10 | $ 0.10 |  | $ 1.10 | [2] | $ 0.09 | $ 0.09 | $ 0.09 |  | $ 0.09 | $ 1.07 | [2] | $ 0.07 | $ 0.07 |  | $ 2.00 | $ 1.37 | $ 1.30
Dividends paid on common stock |  | $ 66,642 | [1] | $ 3,991 |  | $ 3,917 | $ 4,645 | [3] | $ 42,884 | [2] | $ 3,508 | $ 3,509 | $ 4,053 | [3] | $ 3,502 | $ 41,632 | [2] | $ 2,723 | $ 2,758 | [3] | $ 79,195 | $ 53,954 | $ 50,615
Supplemental dividend per share declared |  |  |  | $ 1.60 |  |  |  |  | $ 1.00 |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  |
Supplemental dividend per share paid |  | $ 1.60 |  |  |  |  |  |  | $ 1.00 |  |  |  |  |  |  | 1.00 |  |  |  |  |  |  |
Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized |  | 50,000,000 |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 | 50,000,000 |
Preferred stock, shares issued |  | 0 |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Preferred stock, shares outstanding |  | 0 |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share |  | $ 0.10 |  | $ 1.70 | [1] | $ 0.10 | $ 0.10 |  | $ 1.10 | [2] | $ 0.09 | $ 0.09 | $ 0.09 |  | $ 0.09 | $ 1.07 | [2] | $ 0.07 | $ 0.07 |  | $ 2.00 | $ 1.37 | $ 1.30
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Feb. 05, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Mar. 15, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Feb. 22, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | During third quarter 2020, our board of directors declared a supplemental dividend of $1.60 per share on our common stock, which was paid in fourth quarter 2020.
[2] | During each fourth quarter 2019 and third quarter 2018, our board of directors declared and paid a supplemental dividend of $1.00 per share of our common stock
[3] | Includes payments of dividend equivalents on RSUs and PSUs which vested in first quarter of each year.

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