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Basis of Presentation - Calculations of 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
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]                
Net income (loss) $ 24,253 $ 16,590 $ 13,737 $ 4,975 $ (23,814) $ (1,893) $ 54,580 $ (20,732)
Less: Dividends and undistributed income (loss) allocated to participating securities 0     0     0 (10)
Income (loss) attributable to common stockholders 24,253     4,975     54,580 (20,722)
Income (loss) attributable to common stockholders $ 24,253     $ 4,975     $ 54,580 $ (20,722)
Basic weighted-average common shares outstanding (in shares) 18,292     18,093     18,243 18,014
Add: dilutive effect of equity instruments (in shares) 197     10     173 0
Diluted weighted-average shares outstanding (in shares) 18,489     18,103     18,416 18,014
Earnings (loss) per share - basic (in dollars per share) $ 1.33     $ 0.27     $ 2.99 $ (1.15)
Earnings (loss) per share - diluted (in dollars per share) $ 1.31     $ 0.27     $ 2.96 $ (1.15)
Total shares excluded from diluted shares outstanding (in shares) 0     100     500 900