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Earnings per Share and Dividends - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Payment Arrangement [Abstract]        
Income from continuing operations $ 6,732 $ 1,412 $ 11,637 $ 1,026
Total income from discontinued operations, net of tax 886,326 33,509 986,364 76,422
Net income $ 893,058 $ 34,921 $ 998,001 $ 77,448
Basic weighted average shares outstanding (in shares) 49,984 49,911 49,984 49,889
Basic - Income from continuing operations (in dollars per share) $ 0.13 $ 0.03 $ 0.23 $ 0.02
Basic - Income from discontinued operations, net of tax (in dollars per share) 17.73 0.67 19.73 1.53
Basic net income per share (in dollars per share) $ 17.86 $ 0.70 $ 19.96 $ 1.55
Effect from dilutive shares and options outstanding (in shares) 136 194 152 160
Diluted weighted average shares outstanding (in shares) 50,120 50,105 50,136 50,049
Diluted - Income from continuing operations (in dollars per share) $ 0.13 $ 0.03 $ 0.23 $ 0.02
Diluted - Income from discontinued operations, net of tax (in dollars per share) 17.68 0.67 19.67 1.53
Diluted net income per share (in dollars per share) $ 17.81 $ 0.70 $ 19.90 $ 1.55