Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 923,735	$ 1,051,099
Accounts receivable, less allowance for doubtful accounts of $15,345 in 2018 and $12,858 in 2017	1,581,530	1,414,741
Deferred contract costs	159,510	0
Other	70,041	75,612
Total current assets	2,734,816	2,541,452
Property and equipment, net	504,105	525,203
Goodwill	7,927	7,927
Deferred Federal and state income taxes, net	40,465	13,207
Other assets, net	27,246	29,219
Total assets	3,314,559	3,117,008
Current Liabilities:
Accounts payable	902,259	866,305
Accrued expenses, primarily salaries and related costs	215,813	206,320
Contract liabilities	190,343	0
Federal, state and foreign income taxes	18,424	20,494
Total current liabilities	1,326,839	1,093,119
Noncurrent Federal income tax payable	0	29,516
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 171,582 shares at December 31, 2018 and 176,374 shares at December 31, 2017	1,716	1,764
Additional paid-in capital	1,896	546
Retained earnings	2,088,707	2,063,512
Accumulated other comprehensive loss	(105,481)	(73,964)
Total shareholders’ equity	1,986,838	1,991,858
Noncontrolling interest	882	2,515
Total equity	1,987,720	1,994,373
Total liabilities and equity	$ 3,314,559	$ 3,117,008