CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings
Balance at Dec. 31, 2019	$ 824,953	$ 1,161	$ 574,955	$ 248,837
Balance, shares at Dec. 31, 2019		116,052
Vesting of restricted stock units		$ 6	(6)
Vesting of restricted stock units, shares		579
Stock-based compensation expense	3,254		3,254
Exercise of stock options	398		398
Exercise of stock options, shares		82
Shares withheld for restricted stock units vested	(3,834)	$ (2)	(3,832)
Shares withheld for restricted stock units vested, shares		(168)
Net income	8,767			8,767
Balance at Mar. 31, 2020	833,538	$ 1,165	574,769	257,604
Balance, shares at Mar. 31, 2020		116,545
Balance at Dec. 31, 2019	824,953	$ 1,161	574,955	248,837
Balance, shares at Dec. 31, 2019		116,052
Net income	87,691
Balance at Jun. 30, 2020	915,934	$ 1,167	578,239	336,528
Balance, shares at Jun. 30, 2020		116,701
Balance at Mar. 31, 2020	833,538	$ 1,165	574,769	257,604
Balance, shares at Mar. 31, 2020		116,545
Vesting of restricted stock units		$ 2	(2)
Vesting of restricted stock units, shares		130
Stock-based compensation expense	3,466		3,466
Exercise of stock options	325		325
Exercise of stock options, shares		48
Shares withheld for restricted stock units vested	(319)		(319)
Shares withheld for restricted stock units vested, shares		(22)
Net income	78,924			78,924
Balance at Jun. 30, 2020	915,934	$ 1,167	578,239	336,528
Balance, shares at Jun. 30, 2020		116,701
Balance at Dec. 31, 2020	$ 1,152,783	$ 1,168	589,241	562,374
Balance, shares at Dec. 31, 2020	116,829	116,829
Merger consideration	$ 3,658,362	$ 896	3,657,466
Merger consideration, shares		89,586
Vesting of restricted stock units		$ 6	(6)
Vesting of restricted stock units, shares		648
Stock-based compensation expense	10,402		10,402
Exercise of stock options	235	$ 1	234
Exercise of stock options, shares		27
Shares withheld for restricted stock units vested	(10,417)	$ (2)	(10,415)
Shares withheld for restricted stock units vested, shares		(232)
Net income	172,580			172,580
Balance at Mar. 31, 2021	4,983,945	$ 2,069	4,246,922	734,954
Balance, shares at Mar. 31, 2021		206,858
Balance at Dec. 31, 2020	$ 1,152,783	$ 1,168	589,241	562,374
Balance, shares at Dec. 31, 2020	116,829	116,829
Net income	$ 669,815
Balance at Jun. 30, 2021	$ 5,482,455	$ 2,072	4,248,194	1,232,189
Balance, shares at Jun. 30, 2021	207,196	207,196
Balance at Mar. 31, 2021	$ 4,983,945	$ 2,069	4,246,922	734,954
Balance, shares at Mar. 31, 2021		206,858
Vesting of restricted stock units		$ 5	(5)
Vesting of restricted stock units, shares		472
Stock-based compensation expense	8,465		8,465
Exercise of stock options	99		99
Exercise of stock options, shares		16
Shares withheld for restricted stock units vested	(7,289)	$ (2)	(7,287)
Shares withheld for restricted stock units vested, shares		(150)
Net income	497,235			497,235
Balance at Jun. 30, 2021	$ 5,482,455	$ 2,072	$ 4,248,194	$ 1,232,189
Balance, shares at Jun. 30, 2021	207,196	207,196