CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 770,560	$ 582,585
Accounts receivable, net of allowance of $1,557 and $1,186, respectively	297,685	265,639
Unbilled revenues	104,652	86,500
Prepaid and other current assets	26,171	25,309
Total current assets	1,199,068	960,033
Property and equipment, net	102,646	86,419
Intangible assets, net	57,065	44,511
Goodwill	166,832	119,531
Deferred tax assets	69,983	24,974
Other noncurrent assets	16,208	14,788
Total assets	1,611,802	1,250,256
Current liabilities
Accounts payable	7,444	5,574
Accrued expenses and other current liabilities	127,937	89,812
Due to employees	49,683	38,757
Deferred compensation due to employees	9,920	5,964
Taxes payable, current	67,845	40,860
Total current liabilities	262,829	180,967
Long-term debt	25,031	25,033
Taxes payable, noncurrent	43,685	59,874
Other noncurrent liabilities	17,661	9,435
Total liabilities	349,206	275,309
Commitments and contingencies (Note 14)
Stockholders’ equity
Common stock, $0.001 par value; 160,000,000 authorized; 54,099,927 and 53,003,420 shares issued, 54,080,192 and 52,983,685 shares outstanding at December 31, 2018 and December 31, 2017, respectively	54	53
Additional paid-in capital	544,700	473,874
Retained earnings	759,533	518,820
Treasury stock	(177)	(177)
Accumulated other comprehensive loss	(41,514)	(17,623)
Total stockholders’ equity	1,262,596	974,947
Total liabilities and stockholders’ equity	$ 1,611,802	$ 1,250,256