Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents	$ 1,370,456	$ 1,512,883
Accounts receivable, less allowance for credit loss of $6,382 at March 31, 2024 and $6,550 at December 31, 2023	1,572,356	1,532,599
Deferred contract costs	277,771	218,807
Other	153,111	170,907
Total current assets	3,373,694	3,435,196
Property and equipment, less accumulated depreciation and amortization of $604,458 at March 31, 2024 and $597,473 at December 31, 2023	470,055	479,225
Operating lease right-of-use assets	551,682	516,280
Goodwill	7,927	7,927
Deferred federal and state income taxes, net	64,408	63,690
Other assets, net	20,502	21,491
Total assets	4,488,268	4,523,809
Current Liabilities:
Accounts payable	927,129	860,856
Accrued liabilities, primarily salaries and related costs	433,599	447,336
Contract liabilities	344,552	280,909
Current portion of operating lease liabilities	100,673	99,749
Federal, state and foreign income taxes	20,388	15,562
Total current liabilities	1,826,341	1,704,412
Noncurrent portion of operating lease liabilities	464,262	427,984
Commitments and contingencies
Shareholders’ Equity:
Preferred stock, none issued	0	0
Common stock, par value $0.01 per share. Issued and outstanding: 141,119 shares at March 31, 2024 and 143,866 shares at December 31, 2023	1,411	1,439
Additional paid-in capital	0	0
Retained earnings	2,401,525	2,580,968
Accumulated other comprehensive loss	(207,474)	(192,057)
Total shareholders’ equity	2,195,462	2,390,350
Noncontrolling interest	2,203	1,063
Total equity	2,197,665	2,391,413
Total liabilities and equity	$ 4,488,268	$ 4,523,809