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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Net income $ 18,330 $ 13,850 $ 17,665 $ 12,338 $ 1,952 $ 63,722 $ 32,180 $ 65,674
Less income allocated to non-controlling interests (91)       (82)   (179) (171)
Less income allocated to participating securities:                
Non-forfeitable dividends on participating securities (113)       (97)   (233) (191)
Income allocated to participating securities               (87)
Total net income allocated to participating securities (113)       (97)   (233) (278)
Net income available to common stockholders 18,126       1,773   31,768 65,225
Net income for diluted net income per share $ 18,126       $ 1,773   $ 31,768 $ 65,225
Reconciliation of shares                
Shares for basic net income per share 39,169,000       39,055,000   39,135,000 39,298,000
Effect of dilutive securities:                
Total effect of dilutive securities (in shares) 1,000       82,000   1,000 82,000
Shares for diluted net income per share 39,170,000       39,137,000   39,136,000 39,380,000
Basic net income per share (in dollars per share) $ 0.46       $ 0.05   $ 0.81 $ 1.66
Diluted net income per share (in dollars per share) $ 0.46       $ 0.05   $ 0.81 $ 1.66
Stock options                
Effect of dilutive securities:                
Stock options and performance-based stock units (in shares) 1,000           1,000  
Performance-based stock units                
Effect of dilutive securities:                
Stock options and performance-based stock units (in shares)         82,000     82,000
Performance-based stock units would be earned based on TSR targets 0           0