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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. 07, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 |  | 44,697,880 |  |  |  |  |  |  |  | 44,568,299 |  |  |  |  |  |  |  |  |  |  |  | 44,697,880 | 44,568,299 |
Common stock, outstanding |  | 39,330,807 |  |  |  |  |  |  |  | 39,201,226 |  |  |  |  |  |  |  |  |  |  |  | 39,330,807 | 39,201,226 |
Dividends paid on common stock, per share |  | $ 3.12 | [1] | $ 0.10 | [1] | $ 2.10 | [1] | $ 0.10 |  | $ 0.10 | [2] | $ 1.70 | $ 0.10 | $ 0.10 |  | $ 1.10 | [3] | $ 0.09 | $ 0.09 | $ 0.09 |  | $ 5.42 | $ 2.00 | $ 1.37
Dividends paid on common stock |  | $ 122,712 |  | $ 82,596 |  | $ 3,933 |  | $ 4,440 | [4] | $ 66,642 | [2] | $ 3,991 | $ 3,917 | $ 4,645 | [4] | $ 42,884 |  | $ 3,508 | $ 3,509 | $ 4,053 | [4] | $ 213,681 | $ 79,195 | $ 53,954
Supplemental dividend per share declared |  | $ 3.00 |  |  |  | $ 2.00 |  |  |  |  |  | $ 1.60 |  |  |  | $ 1.00 |  |  |  |  |  |  |  |
Supplemental dividend per share paid |  | $ 3.00 |  | $ 2.00 |  |  |  |  |  | $ 1.60 |  |  |  |  |  | 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 |  | $ 3.12 | [1] | $ 0.10 | [1] | $ 2.10 | [1] | $ 0.10 |  | $ 0.10 | [2] | $ 1.70 | $ 0.10 | $ 0.10 |  | $ 1.10 | [3] | $ 0.09 | $ 0.09 | $ 0.09 |  | $ 5.42 | $ 2.00 | $ 1.37
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date Declared | Feb. 07, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.12 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Mar. 15, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Feb. 22, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | During second quarter 2021, our board of directors declared a supplemental dividend of $2.00 per share on our common stock, which was paid in the third quarter 2021. During fourth quarter 2021, our board of directors declared and paid a supplemental dividend of $3.00 per share on our common stock.
[2] | 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.
[3] | During fourth quarter 2019, our board of directors declared and paid a supplemental dividend of $1.00 per share of our common stock.
[4] | Includes payments of dividend equivalents on RSUs and PSUs which vested in first quarter of each year.

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