CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 46,335	$ 62,134
Short-term marketable securities	203,753	188,323
Accounts receivable, net of allowances for doubtful accounts of $525 in 2017 and 2016	15,046	6,528
Inventories	51,149	52,564
Prepaid expenses and other current assets	16,770	8,715
Total current assets	333,053	318,264
PROPERTY AND EQUIPMENT, net	105,893	95,296
INTANGIBLE ASSETS, net	29,890	31,502
GOODWILL	91,849	91,849
DEFERRED TAX ASSETS	19,857	11,342
OTHER ASSETS	8,118	6,157
Total assets	588,660	554,410
CURRENT LIABILITIES:
Accounts payable	37,478	29,727
Accrued payroll and related expenses	9,146	10,756
Taxes payable	877	729
Other accrued liabilities	3,409	2,734
Total current liabilities	50,910	43,946
LONG-TERM INCOME TAXES PAYABLE	2,804	2,639
DEFERRED TAX LIABILITIES	688	820
OTHER LIABILITIES	4,115	3,921
Total liabilities	58,517	51,326
COMMITMENTS AND CONTINGENCIES (Notes 11, 12 and 13)
STOCKHOLDERS’ EQUITY:
Common stock	29	28
Additional paid-in capital	182,235	172,875
Accumulated other comprehensive loss	(2,514)	(2,710)
Retained earnings	350,393	332,891
Total stockholders’ equity	530,143	503,084
Total liabilities and stockholders’ equity	$ 588,660	$ 554,410