Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 1,215,970	$ 923,735
Accounts receivable, less allowance for doubtful accounts of $11,853 at September 30, 2019 and $15,345 at December 31, 2018	1,319,032	1,581,530
Deferred contract costs	130,690	159,510
Other	103,521	70,041
Total current assets	2,769,213	2,734,816
Property and equipment, less accumulated depreciation and amortization of $468,059 at September 30, 2019 and $446,977 at December 31, 2018	494,153	504,105
Operating lease right-of-use assets	374,231	0
Goodwill	7,927	7,927
Deferred federal and state income taxes, net	44,351	40,465
Other assets, net	16,578	27,246
Total assets	3,706,453	3,314,559
Current Liabilities:
Accounts payable	744,002	902,259
Accrued expenses, primarily salaries and related costs	207,752	215,813
Contract liabilities	152,717	190,343
Current portion of operating lease liabilities	61,842	0
Federal, state and foreign income taxes	17,273	18,424
Total current liabilities	1,183,586	1,326,839
Noncurrent portion of operating lease liabilities	313,580	0
Commitments and contingencies	0	0
Shareholders’ Equity:
Preferred stock, none issued	0	0
Common stock, par value $0.01 per share. Issued and outstanding: 170,243 shares at September 30, 2019 and 171,582 shares at December 31, 2018	1,702	1,716
Additional paid-in capital	23,301	1,896
Retained earnings	2,301,156	2,088,707
Accumulated other comprehensive loss	(118,774)	(105,481)
Total shareholders’ equity	2,207,385	1,986,838
Noncontrolling interest	1,902	882
Total equity	2,209,287	1,987,720
Total liabilities and equity	$ 3,706,453	$ 3,314,559