Earnings Per Share of Common Stock (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Basic earnings per share of common stock:
Net income attributable to common stockholders	$ 352,677	$ 72,696	$ 658,920	$ 118,831
Weighted-average common stock outstanding (in shares)	77,790	78,335	78,240	77,996
Basic earnings per share of common stock (in dollars per share)	$ 4.53	$ 0.93	$ 8.42	$ 1.52
Diluted earnings per share of common stock:
Net income attributable to common stockholders	$ 352,677	$ 72,696	$ 658,920	$ 118,831
Weighted-average common stock outstanding applicable to basic earnings per share (in shares)	77,790	78,335	78,240	77,996
Effect of dilutive shares:
Common shares issuable under stock-based compensation plans (in shares)	2,634	983	3,001	1,305
Weighted-average shares of common stock applicable to diluted earnings per share (in shares)	80,424	79,318	81,241	79,301
Diluted earnings per share of common stock (in dollars per share)	$ 4.39	$ 0.92	$ 8.11	$ 1.50
Total anti-dilutive shares and units (in shares)	774	2,793	591	2,393
Performance-based RSUs
Effect of dilutive shares:
Total anti-dilutive shares and units (in shares)	422	1,811	292	1,547
Time-based RSUs
Effect of dilutive shares:
Total anti-dilutive shares and units (in shares)	79		110	1
Stock Options
Effect of dilutive shares:
Total anti-dilutive shares and units (in shares)	273	982	189	845
Weighted-average exercise price of anti-dilutive stock options (in dollars per share)	$ 35.03	$ 18.34	$ 35.03	$ 18.34