CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment
Balance at beginning of period at Dec. 31, 2019	$ 612,517	$ (388)		$ 380,079	$ 232,438	$ (388)
Balance at beginning of period (in shares) at Dec. 31, 2019			45,476
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Exercise of common stock options	$ 19,478			19,478
Exercise of common stock options (in shares)			539
Restricted stock, net of forfeitures and shares withheld for taxes	(4,893)			(4,893)
Restricted stock, net of forfeitures and shares withheld for taxes (in shares)			20
Stock-based compensation	23,263			23,263
Net income	24,057				24,057
Balance at end of period at Mar. 31, 2020	674,034			417,927	256,107
Balance at end of period (in shares) at Mar. 31, 2020			46,035
Balance at beginning of period at Dec. 31, 2020	1,013,145			538,778	474,367
Balance at beginning of period (in shares) at Dec. 31, 2020			47,340
Exercise of common stock options	12,621			12,621
Exercise of common stock options (in shares)			180
Restricted stock, net of forfeitures and shares withheld for taxes	(17,080)			(17,080)
Restricted stock, net of forfeitures and shares withheld for taxes (in shares)			11
Stock-based compensation	52,985			52,985
Net income	22,642				22,642
Balance at end of period at Mar. 31, 2021	$ 1,084,313			$ 587,304	$ 497,009
Balance at end of period (in shares) at Mar. 31, 2021			47,531