Earnings Per Share of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic earnings per share of common stock:
Net income attributable to common stockholders	$ 535,160	$ 121,473	$ 1,194,080	$ 240,304
Weighted-average common stock outstanding (in shares)	72,439	78,361	76,292	78,119
Basic earnings per share of common stock (in dollars per share)	$ 7.39	$ 1.55	$ 15.65	$ 3.08
Diluted earnings per share of common stock:
Net income attributable to common stockholders	$ 535,160	$ 121,473	$ 1,194,080	$ 240,304
Weighted-average common stock outstanding applicable to basic earnings per share (in shares)	72,439	78,361	76,292	78,119
Effect of dilutive shares:
Common shares issuable under stock-based compensation plans (in shares)	3,699	2,021	3,326	1,702
Weighted-average shares of common stock applicable to diluted earnings per share (in shares)	76,138	80,382	79,618	79,821
Diluted earnings per share of common stock (in dollars per share)	$ 7.03	$ 1.51	$ 15.00	$ 3.01
Total anti-dilutive shares and units (in shares)		1,723	552	1,873
Performance-based RSUs
Effect of dilutive shares:
Total anti-dilutive shares and units (in shares)		1,157	335	985
Stock Options
Effect of dilutive shares:
Total anti-dilutive shares and units (in shares)		566	217	888
Weighted-average exercise price of anti-dilutive stock options (in dollars per share)		$ 23.50	$ 35.03	$ 23.98