Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current Assets:
Cash and cash equivalents	$ 1,728,692	$ 1,527,791
Accounts receivable, net	3,810,286	1,998,055
Deferred contract costs	987,266	327,448
Other	108,801	110,250
Total current assets	6,635,045	3,963,544
Property and equipment, net	487,870	506,425
Operating lease right-of-use assets	459,158	432,723
Goodwill	7,927	7,927
Deferred federal and state income taxes, net	729
Other assets, net	19,200	16,884
Total assets	7,609,929	4,927,503
Current Liabilities:
Accounts payable	2,012,461	1,136,859
Accrued expenses, primarily salaries and related costs	403,625	257,021
Contract liabilities	1,142,026	379,722
Current portion of operating lease liabilities	82,019	74,004
Federal, state and foreign income taxes	86,166	45,437
Total current liabilities	3,726,297	1,893,043
Noncurrent portion of operating lease liabilities	385,641	364,185
Deferred federal and state income taxes, net		7,048
Commitments and contingencies
Shareholders’ Equity:
Preferred stock, par value $0.01 per share, authorized 2,000 shares; none issued
Common stock, par value $0.01 per share, authorized 640,000. Issued and outstanding: 167,210 shares and 169,294 shares at December 31, 2021 and 2020, respectively	1,672	1,693
Additional paid-in capital	3,160	157,496
Retained earnings	3,620,008	2,600,201
Accumulated other comprehensive loss	(130,414)	(99,753)
Total shareholders’ equity	3,494,426	2,659,637
Noncontrolling interest	3,565	3,590
Total equity	3,497,991	2,663,227
Total liabilities and equity	$ 7,609,929	$ 4,927,503