CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 471,637	$ 437,353
Short-term investments, net	208,446	186,685
Accounts receivable, net of allowance for credit losses of $7,323 and $7,253 as of March 31, 2021 and December 31, 2020, respectively	1,368,668	1,584,109
Prepaid expenses and other current assets	121,398	102,170
TOTAL CURRENT ASSETS	2,170,149	2,310,317
Property and equipment, net	115,914	115,863
Operating lease assets	237,917	248,143
Deferred income taxes	50,168	50,168
Other assets, non-current	28,551	29,154
TOTAL ASSETS	2,602,699	2,753,645
Current liabilities:
Accounts payable	1,142,258	1,348,480
Accrued expenses and other current liabilities	83,530	88,335
Operating lease liabilities	37,688	37,868
TOTAL CURRENT LIABILITIES	1,263,476	1,474,683
Operating lease liabilities, non-current	245,899	254,562
Other liabilities, non-current	9,011	11,255
TOTAL LIABILITIES	1,518,386	1,740,500
Commitments and contingencies (Note 10)
STOCKHOLDERS’ EQUITY
Preferred stock, par value $0.000001; 100,000 shares authorized, zero shares issued and outstanding as of March 31, 2021 and December 31, 2020
Common stock, par value $0.000001 Class A, 1,000,000 shares authorized; 43,025 and 42,338 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively Class B, 95,000 shares authorized; 4,506 and 5,002 shares issued and outstanding as of March 31, 2021 and December 31, 2020, respectively	0	0
Additional paid-in capital	587,304	538,778
Retained earnings	497,009	474,367
TOTAL STOCKHOLDERS’ EQUITY	1,084,313	1,013,145
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 2,602,699	$ 2,753,645