CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 130,590	$ 207,232
Short-term investments	100,461
Accounts receivable, net	830,646	834,764
Prepaid expenses and other current assets	22,319	14,527
TOTAL CURRENT ASSETS	1,084,016	1,056,523
Property and equipment, net	43,521	33,046
Operating lease assets	82,711
Deferred income taxes	8,460	8,460
Other assets, non-current	20,743	19,843
TOTAL ASSETS	1,239,451	1,117,872
Current liabilities:
Accounts payable	616,222	669,147
Accrued expenses and other current liabilities	37,429	44,844
Operating lease liabilities	16,822
TOTAL CURRENT LIABILITIES	670,473	713,991
Operating lease liabilities, non-current	71,699
Other liabilities, non-current	5,058	9,314
TOTAL LIABILITIES	747,230	723,305
Commitments and contingencies (Note 9)
STOCKHOLDERS’ EQUITY
Preferred stock, par value $0.000001; 100,000 shares authorized, zero shares issued and outstanding as of June 30, 2019 and December 31, 2018
Common stock, par value $0.000001 Class A, 1,000,000 shares authorized; 38,950 and 36,822 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively Class B, 95,000 shares authorized; 5,973 and 7,042 shares issued and outstanding as of June 30, 2019 and December 31, 2018, respectively	0	0
Additional paid-in capital	330,150	270,447
Retained earnings	162,071	124,120
TOTAL STOCKHOLDERS’ EQUITY	492,221	394,567
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 1,239,451	$ 1,117,872