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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Basic Net Income Per Share        
Net income $ 71,746 $ 77,944 $ 221,350 $ 152,289
Weighted average common shares outstanding (in shares) 165,258 164,773 165,144 165,748
Effect of dilutive securities:        
Restricted stock (in shares) 660 611 696 586
Stock options and appreciation rights (in shares) 21 35 22 36
Basic Net Income Per Share (in dollars per share) $ 0.43 $ 0.47 $ 1.34 $ 0.92
Diluted Net Income Per Share        
Net income $ 71,746 $ 77,944 $ 221,350 $ 152,289
Weighted average common shares outstanding (in shares) 165,258 164,773 165,144 165,748
Weighted average shares outstanding (in shares) 165,939 165,419 165,862 166,370
Diluted Net Income Per Share (in dollars per share) $ 0.43 $ 0.47 $ 1.33 $ 0.92