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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Basic EPS [Abstract]        
Weighted average common shares outstanding (in shares) 43,637,000 43,809,000 43,735,000 43,797,000
Net income available to common stockholders $ 24,713 $ 30,555 $ 35,081 $ 59,682
Basic EPS (in dollars per share) $ 0.57 $ 0.70 $ 0.80 $ 1.36
Diluted EPS [Abstract]        
Weighted average common shares outstanding (in shares) 43,637,000 43,809,000 43,735,000 43,797,000
Dilutive effect of common stock options and restricted stock (in shares) 291,000 311,000 291,000 300,000
Weighted average common shares and common share equivalents (in shares) 43,928,000 44,120,000 44,026,000 44,097,000
Net income available to common stockholders $ 24,713 $ 30,555 $ 35,081 $ 59,682
Diluted EPS (in dollars per share) $ 0.56 $ 0.69 $ 0.80 $ 1.35
Stock Options [Member]        
Earnings Per Share [Abstract]        
Stock options excluded from calculation of diluted EPS (in shares) 3,250 1,500 3,250 1,500