Net Income Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income—basic	$ 600,671	$ 393,626	$ 672,309
Net income—diluted	$ 600,671	$ 393,626	$ 672,309
Average common shares outstanding—basic	188,370,000	195,443,000	208,773,000
Dilutive effect of stock-based compensation arrangements	1,893,000	1,199,000	1,567,000
Adjusted average common shares outstanding—diluted	190,263,000	196,642,000	210,340,000
Net income per share, basic (in usd per share)	$ 3.19	$ 2.01	$ 3.22
Net income per share, diluted (in usd per share)	$ 3.16	$ 2.00	$ 3.20
Stock Compensation Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares of common stock equivalents	28,000	865,000	221,000