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Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net income—basic $ 201,193 $ 155,206 $ 382,324 $ 280,814
Net income—diluted $ 201,193 $ 155,206 $ 382,324 $ 280,814
Average common shares outstanding—basic (in shares) 173,705 193,436 175,491 193,692
Dilutive effect of share-based compensation arrangements (in shares) 1,714 1,202 1,858 1,294
Adjusted average common shares outstanding—diluted (in shares) 175,419 194,638 177,349 194,986
Net income per share        
Basic net income per share (in usd per share) $ 1.16 $ 0.80 $ 2.18 $ 1.45
Diluted net income per share (in usd per share) $ 1.15 $ 0.80 $ 2.16 $ 1.44
Shares of common stock equivalents 189 0 0 0