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