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Stockholders' Equity:Shares and Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Feb. 10, 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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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   44,352,778       44,075,840               44,352,778 44,075,840  
Common stock, outstanding   38,985,705       38,708,767               38,985,705 38,708,767  
Dividends paid on common stock, per share   $ 1.10 [1] $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 1.07 [1] $ 0.07 $ 0.07 $ 0.07 $ 0 $ 0 $ 0 $ 1.37 $ 1.30 $ 0.07
Dividends paid on common stock   $ 42,884 $ 3,508 $ 3,509 $ 4,053 [2] $ 3,502 $ 41,632 $ 2,723 $ 2,758 [2] $ 2,701 $ 0 $ 0 $ 0 $ 53,954 $ 50,615 $ 2,701
Supplemental dividend per share paid   $ 1.00         $ 1.00                  
Supplemental dividend per share declared   $ 1.00         1.00                  
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  
Subsequent Event [Line Items]                                
Dividends declared per common share   $ 1.10 [1] $ 0.09 $ 0.09 $ 0.09 $ 0.09 $ 1.07 [1] $ 0.07 $ 0.07 $ 0.07 $ 0.00 $ 0.00 $ 0.00 $ 1.37 $ 1.30 $ 0.07
Preferred Stock, Shares Outstanding   0       0               0 0  
Subsequent Event [Member]                                
Subsequent Event [Line Items]                                
Dividends Payable, Date Declared Feb. 10, 2020                              
Dividends declared per common share $ 0.10                              
Dividends Payable, Date to be Paid Mar. 16, 2020                              
Dividends Payable, Date of Record Feb. 24, 2020                              
[1]
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.
[2]
Includes payments of dividend equivalents on RSUs and PSUs which vested in first quarter of each year.