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Earnings (Loss) Per Share (Computation of Earnings (Loss) Per Common Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Net income (loss) $ (45,174) $ 327,380 $ 323,770
Net income or dividends allocated to participating securities - basic and diluted 1,756 5,546 5,930
Net income (loss) allocated to common shareholders - basic and diluted $ (46,930) $ 321,834 $ 317,840
Weighted-average common shares - basic 86,533 86,488 85,355
Dilutive potential common shares   111 166
Weighted average common shares - diluted 86,533 86,599 85,521
Earnings (loss) per common share: Basic $ (0.54) $ 3.72 $ 3.72
Earnings (loss) per common share: Diluted $ (0.54) $ 3.72 $ 3.72