CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
Revenue	$ 934,842	$ 713,672	$ 501,003
Cost of sales	237,027	176,814	121,104
Gross profit	697,815	536,858	379,899
Selling, general, and administrative	563,656	445,819	310,836
Income from operations	134,159	91,039	69,063
Other income
Interest income, net	246	1,295	1,306
Other income (expense)	(140)	29	179
Other income (expense)	106	1,324	1,485
Income from operations before income taxes	134,265	92,363	70,548
Provision for income taxes	31,406	14,447	14,759
Net income	$ 102,859	$ 77,916	$ 55,789
Basic earnings per share
Earnings per share - basic	$ 8.74	$ 6.62	$ 4.67
Diluted earnings per share
Earnings per share - diluted	$ 8.68	$ 6.43	$ 4.62
Weighted average shares outstanding -
Basic	11,771	11,771	11,947
Diluted	11,850	12,117	12,079
Cash dividends declared per share	$ 4.52	$ 3.38	$ 2.19