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Stockholders' Equity:Shares and Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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.