Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current Assets:
Cash and cash equivalents	$ 1,527,791	$ 1,230,491
Accounts receivable, net	1,998,055	1,315,091
Deferred contract costs	327,448	131,783
Other	110,250	92,558
Total current assets	3,963,544	2,769,923
Property and equipment, net	506,425	499,344
Operating lease right-of-use assets	432,723	390,035
Goodwill	7,927	7,927
Deferred federal and state income taxes, net	0	8,034
Other assets, net	16,884	16,621
Total assets	4,927,503	3,691,884
Current Liabilities:
Accounts payable	1,136,859	735,695
Accrued expenses, primarily salaries and related costs	257,021	189,446
Contract liabilities	379,722	154,183
Current portion of operating lease liabilities	74,004	65,367
Federal, state and foreign income taxes	45,437	23,627
Total current liabilities	1,893,043	1,168,318
Noncurrent portion of operating lease liabilities	364,185	326,347
Deferred federal and state income taxes, net	7,048	0
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:169,294 shares at December 31, 2020 and 169,622 shares at December 31, 2019	1,693	1,696
Additional paid-in capital	157,496	3,203
Retained earnings	2,600,201	2,321,316
Accumulated other comprehensive loss	(99,753)	(131,187)
Total shareholders’ equity	2,659,637	2,195,028
Noncontrolling interest	3,590	2,191
Total equity	2,663,227	2,197,219
Total liabilities and equity	$ 4,927,503	$ 3,691,884