CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 134,137	$ 93,655
Short-term marketable securities	94,451	189,236
Accounts receivable, net of allowance for doubtful accounts of $706 and $734 in 2018 and 2017, respectively	11,072	16,798
Inventories	80,857	57,087
Prepaid expenses and other current assets	11,915	7,758
Total current assets	332,432	364,534
PROPERTY AND EQUIPMENT, net	114,117	111,705
INTANGIBLE ASSETS, net	21,152	25,419
GOODWILL	91,849	91,849
DEFERRED TAX ASSETS	6,906	2,364
OTHER ASSETS	22,241	25,203
Total assets	588,697	621,074
CURRENT LIABILITIES:
Accounts payable	31,552	33,211
Accrued payroll and related expenses	12,131	12,064
Taxes payable	933	1,767
Other accrued liabilities	3,750	4,009
Total current liabilities	48,366	51,051
LONG-TERM INCOME TAXES PAYABLE	8,652	18,259
DEFERRED TAX LIABILITIES	216	138
OTHER LIABILITIES	4,391	3,944
Total liabilities	61,625	73,392
STOCKHOLDERS’ EQUITY:
Common stock, $0.001 par value Authorized - 140,000,000 shares Outstanding - 28,888,643 and 29,782,455 shares in 2018 and 2017, respectively	28	29
Additional paid-in capital	126,164	198,384
Accumulated other comprehensive loss	(1,689)	(2,139)
Retained earnings	402,569	351,408
Total stockholders’ equity	527,072	547,682
Total liabilities and stockholders’ equity	$ 588,697	$ 621,074