Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 1,512,883	$ 2,034,131
Accounts receivable, net	1,532,599	2,107,645
Deferred contract costs	218,807	257,545
Other	170,907	118,696
Total current assets	3,435,196	4,518,017
Property and equipment, net	479,225	501,916
Operating lease right-of-use assets	516,280	507,503
Goodwill	7,927	7,927
Deferred federal and state income taxes, net	63,690	37,449
Other assets, net	21,491	17,622
Total assets	4,523,809	5,590,434
Current Liabilities:
Accounts payable	860,856	1,108,996
Accrued expenses, primarily salaries and related costs	447,336	479,262
Contract liabilities	280,909	323,101
Current portion of operating lease liabilities	99,749	95,621
Federal, state and foreign income taxes	15,562	47,075
Total current liabilities	1,704,412	2,054,055
Noncurrent portion of operating lease liabilities	427,984	422,844
Commitments and contingencies
Shareholders’ Equity:
Preferred stock, par value $0.01 per share, authorized 2,000 shares; none issued	0	0
Common stock, par value $0.01 per share, authorized 640,000. Issued and outstanding: 143,866 shares and 154,313 shares at December 31, 2023 and 2022, respectively	1,439	1,543
Additional paid-in capital	0	139
Retained earnings	2,580,968	3,310,892
Accumulated other comprehensive loss	(192,057)	(202,553)
Total shareholders’ equity	2,390,350	3,110,021
Noncontrolling interest	1,063	3,514
Total equity	2,391,413	3,113,535
Total liabilities and equity	$ 4,523,809	$ 5,590,434