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Net Income Per Common Share (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, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income                 $ 56,224 $ 95,677 $ 80,872
Less income allocated to non-controlling interests                 (363) (384) (346)
Less income allocated to participating securities:                      
Non-forfeitable dividends on participating securities                 (458) (397) (372)
Income allocated to participating securities                   (25) (19)
Total net income allocated to participating securities                 (458) (422) (391)
Net income available to common stockholders                 55,403 94,871 80,135
Net income for diluted net income per share                 $ 55,403 $ 94,871 $ 80,135
Shares for basic net income per share                 39,156,000 39,179,000 39,571,000
Effect of dilutive securities:                      
Total effect of dilutive securities (in shares)                   85,000 188,000
Shares for diluted net income per share                 39,156,000 39,264,000 39,759,000
Basic (in dollars per share) $ 0.32 $ 0.28 $ 0.46 $ 0.35 $ 0.45 $ 0.31 $ 0.05 $ 1.60 $ 1.41 $ 2.42 $ 2.03
Diluted (in dollars per share) $ 0.32 $ 0.28 $ 0.46 $ 0.35 $ 0.45 $ 0.31 $ 0.05 $ 1.60 $ 1.41 $ 2.42 $ 2.02
Stock options                      
Effect of dilutive securities:                      
Stock options and performance-based stock units (in shares)                     4,000
Performance-based stock units                      
Effect of dilutive securities:                      
Stock options and performance-based stock units (in shares)                   85,000 184,000
Performance-based stock units would be earned based on TSR targets 0               0