Stockholders' Equity and EPS - Reconciliation of Basic EPS to Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income available to common stockholders	$ 532,220	$ 132,253
Denominator:
Weighted average common shares outstanding-basic (in shares)	52,180	51,565
Weighted average common shares outstanding—diluted (in shares)	53,076	51,944
Earnings per common share:
Basic (dollars per share)	$ 10.20	$ 2.56
Diluted (dollars per share)	$ 10.03	$ 2.55
Stock options and ESPP
Denominator:
Weighted average effect of dilutive securities (in shares)	294	217
Restricted stock units and awards
Denominator:
Weighted average effect of dilutive securities (in shares)	602	162