Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 1,674,121	$ 1,527,791
Accounts receivable, less allowance for credit loss of $6,104 at June 30, 2021 and $5,579 at December 31, 2020	2,647,516	1,998,055
Deferred contract costs	534,692	327,448
Other	128,933	110,250
Total current assets	4,985,262	3,963,544
Property and equipment, less accumulated depreciation and amortization of $534,790 at June 30, 2021 and $516,988 at December 31, 2020	499,282	506,425
Operating lease right-of-use assets	443,708	432,723
Goodwill	7,927	7,927
Other assets, net	16,992	16,884
Total assets	5,953,171	4,927,503
Current Liabilities:
Accounts payable	1,408,572	1,136,859
Accrued expenses, primarily salaries and related costs	319,696	257,021
Contract liabilities	619,140	379,722
Current portion of operating lease liabilities	80,210	74,004
Federal, state and foreign income taxes	57,608	45,437
Total current liabilities	2,485,226	1,893,043
Noncurrent portion of operating lease liabilities	370,333	364,185
Deferred federal and state income taxes, net	13,961	7,048
Commitments and contingencies
Shareholders’ Equity:
Preferred stock, none issued	0	0
Common stock, par value $0.01 per share. Issued and outstanding: 169,169 shares at June 30, 2021 and 169,294 shares at December 31, 2020	1,692	1,693
Additional paid-in capital	79,357	157,496
Retained earnings	3,104,471	2,600,201
Accumulated other comprehensive loss	(106,066)	(99,753)
Total shareholders’ equity	3,079,454	2,659,637
Noncontrolling interest	4,197	3,590
Total equity	3,083,651	2,663,227
Total liabilities and equity	$ 5,953,171	$ 4,927,503