Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 990,612	$ 1,051,099
Accounts receivable, less allowance for doubtful accounts of $13,696 at September 30, 2018 and $12,858 at December 31, 2017	1,528,524	1,414,741
Deferred contract costs	168,090	0
Other	59,247	75,612
Total current assets	2,746,473	2,541,452
Property and equipment, less accumulated depreciation and amortization of $441,433 at September 30, 2018 and $420,282 at December 31, 2017	510,328	525,203
Goodwill	7,927	7,927
Deferred Federal and state income taxes, net	43,293	13,207
Other assets, net	26,779	29,219
Total assets	3,334,800	3,117,008
Current Liabilities:
Accounts payable	934,509	866,305
Accrued expenses, primarily salaries and related costs	228,785	206,320
Contract liabilities	195,035	0
Federal, state and foreign income taxes	19,139	20,494
Total current liabilities	1,377,468	1,093,119
Noncurrent Federal income taxes payable	0	29,516
Commitments and contingencies
Shareholders' Equity:
Preferred stock, none issued	0	0
Common stock, par value $0.01 per share. Issued and outstanding 172,564 shares at September 30, 2018 and 176,374 shares at December 31, 2017	1,726	1,764
Additional paid-in capital	1,832	546
Retained earnings	2,053,389	2,063,512
Accumulated other comprehensive loss	(101,098)	(73,964)
Total shareholders’ equity	1,955,849	1,991,858
Noncontrolling interest	1,483	2,515
Total equity	1,957,332	1,994,373
Total liabilities and equity	$ 3,334,800	$ 3,117,008