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Summary of Significant Accounting Policies Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 24,004 19,928 77,037
Net income (loss) $ (184,093) $ 232,117 $ 161,802
Less net income (loss) allocated to participating securities (236) (3,413) (2,106)
Net income (loss) attributable to common stock $ (184,329) $ 228,704 $ 159,696
Earnings (loss) per share, basic $ (11.53) $ 14.27 $ 10.02
Weighted-average shares outstanding 15,992,000 16,027,000 15,941,000
Less net income (loss) allocated to participating securities $ (236) $ (3,410) $ (2,104)
Net income (loss) attributable to common stock $ (184,329) $ 228,707 $ 159,698
Earnings (loss) per share, diluted $ (11.53) $ 14.26 $ 10.00
Dilutive effect of stock options and restricted stock 0 51,000 53,000
Adjusted weighted-average shares outstanding under treasury stock method 15,992,000 16,078,000 15,994,000
Participating securities excluded under two-class method 0 (37,000) (27,000)
Adjusted weighted-average shares outstanding under two-class method 15,992,000 16,041,000 15,967,000