CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 916,253	$ 936,552
Trade receivables and contract assets, net of allowance of $5,356 and $2,920, respectively	542,698	497,716
Prepaid and other current assets	48,786	39,943
Total current assets	1,507,737	1,474,211
Property and equipment, net	164,671	165,259
Operating lease right-of-use assets	243,671	238,991
Intangible assets, net	58,676	56,258
Goodwill	198,534	195,043
Deferred tax assets	79,044	75,013
Other noncurrent assets	59,548	39,433
Total assets	2,311,881	2,244,208
Current liabilities
Accounts payable	5,232	7,831
Accrued compensation and benefits expenses	250,560	230,035
Accrued expenses and other current liabilities	66,434	82,476
Income taxes payable, current	6,987	9,064
Operating lease liabilities, current	60,108	57,542
Total current liabilities	389,321	386,948
Long-term debt	25,046	25,074
Income taxes payable, noncurrent	45,847	45,878
Operating lease liabilities, noncurrent	189,312	180,848
Other noncurrent liabilities	14,873	9,315
Total liabilities	664,399	648,063
Commitments and contingencies (Note 12)
Stockholders’ equity
Common stock, $0.001 par value; 160,000,000 authorized; 55,608,835 and 55,207,446 shares issued, 55,589,100 and 55,187,711 shares outstanding at March 31, 2020 and December 31, 2019, respectively	56	55
Additional paid-in capital	610,579	607,051
Retained earnings	1,106,285	1,020,590
Treasury stock	(177)	(177)
Accumulated other comprehensive loss	(69,261)	(31,374)
Total stockholders’ equity	1,647,482	1,596,145
Total liabilities and stockholders’ equity	$ 2,311,881	$ 2,244,208