Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and cash equivalents	$ 1,051,099	$ 974,435
Accounts receivable, less allowance for doubtful accounts of $12,858 in 2017 and $9,247 in 2016	1,414,741	1,190,130
Other	75,612	54,014
Total current assets	2,541,452	2,218,579
Property and equipment, net	525,203	536,572
Goodwill	7,927	7,927
Deferred Federal and state income taxes, net	13,207	0
Other assets, net	29,219	27,793
Total assets	3,117,008	2,790,871
Current Liabilities:
Accounts payable	866,305	726,571
Accrued expenses, primarily salaries and related costs	206,320	185,502
Federal, state and foreign income taxes	20,494	17,858
Total current liabilities	1,093,119	929,931
Noncurrent Federal income tax payable	29,516	0
Deferred Federal and state income taxes, net	0	13,727
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 shares; issued and outstanding 176,374 shares at December 31, 2017 and 179,857 shares at December 31, 2016	1,764	1,799
Additional paid-in capital	546	2,642
Retained earnings	2,063,512	1,944,789
Accumulated other comprehensive loss	(73,964)	(104,592)
Total shareholders’ equity	1,991,858	1,844,638
Noncontrolling interest	2,515	2,575
Total equity	1,994,373	1,847,213
Total liabilities and equity	$ 3,117,008	$ 2,790,871