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Stockholders' Equity Dividends (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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
Dividend paid to parent                              
Common Stock, Dividends, Per Share, Declared $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06      
Dividends, Common Stock, Cash $ 2,588 $ 2,589 $ 2,591 $ 2,582 $ 2,583 $ 2,581 $ 2,578 $ 2,571 $ 2,570 $ 2,571 $ 2,570 $ 2,569 $ 10,350 $ 10,313 $ 10,280
Common Stock, Dividends, Per Share, Declared $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06 $ 0.06      
Dividends, Common Stock, Cash $ 2,588 $ 2,589 $ 2,591 $ 2,582 $ 2,583 $ 2,581 $ 2,578 $ 2,571 $ 2,570 $ 2,571 $ 2,570 $ 2,569 $ 10,350 $ 10,313 $ 10,280