CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 936,552	$ 770,560
Trade receivables and contract assets, net of allowance of $2,920 and $1,557, respectively	497,716	402,337
Prepaid and other current assets	39,943	26,171
Total current assets	1,474,211	1,199,068
Property and equipment, net	165,259	102,646
Operating lease right-of-use assets	238,991	0
Intangible assets, net	56,258	57,065
Goodwill	195,043	166,832
Deferred tax assets	75,013	69,983
Other noncurrent assets	39,433	16,208
Total assets	2,244,208	1,611,802
Current liabilities
Accounts payable	7,831	7,444
Accrued compensation and benefits expenses	230,035	177,594
Accrued expenses and other current liabilities	82,476	50,253
Income taxes payable, current	9,064	27,538
Operating lease liabilities, current	57,542	0
Total current liabilities	386,948	262,829
Long-term debt	25,074	25,031
Income taxes payable, noncurrent	45,878	43,685
Operating lease liabilities, noncurrent	180,848	0
Other noncurrent liabilities	9,315	17,661
Total liabilities	648,063	349,206
Commitments and contingencies (Note 14)
Stockholders’ equity
Common stock, $0.001 par value; 160,000,000 authorized; 55,207,446 and 54,099,927 shares issued, 55,187,711 and 54,080,192 shares outstanding at December 31, 2019 and December 31, 2018, respectively	55	54
Additional paid-in capital	607,051	544,700
Retained earnings	1,020,590	759,533
Treasury stock	(177)	(177)
Accumulated other comprehensive loss	(31,374)	(41,514)
Total stockholders’ equity	1,596,145	1,262,596
Total liabilities and stockholders’ equity	$ 2,244,208	$ 1,611,802