Consolidated Balance Sheets - USD ($) $ in Thousands	Jul. 01, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 129,202	$ 106,582
Short-term investments	353,740	297,961
Accounts receivable, less reserves of $1,501 and $1,568 in 2018 and 2017, respectively	136,084	119,388
Unbilled revenue	3,603	7,454
Inventories	89,556	67,923
Prepaid expenses and other current assets	47,362	30,683
Total current assets	759,547	629,991
Long-term investments	271,941	423,441
Property, plant, and equipment, net	87,893	78,048
Goodwill	113,208	113,208
Intangible assets, net	11,651	13,189
Deferred income taxes	29,892	27,385
Other assets	2,178	2,491
Total assets	1,276,310	1,287,753
Current liabilities:
Accounts payable	12,588	23,463
Accrued expenses	58,654	68,249
Accrued income taxes	12,477	11,503
Deferred revenue and customer deposits	40,881	9,420
Total current liabilities	124,600	112,635
Deferred Income Tax Liabilities, Net	304	312
Reserve for income taxes	7,399	6,488
Accrued Income Taxes	60,241	66,741
Other non-current liabilities	4,634	5,904
Total liabilities	197,178	192,080
Shareholders’ equity:
Common stock, $.002 par value – Authorized: 300,000 and 200,000 shares in 2018 and 2017, respectively, issued and outstanding: 172,032 and 173,507 shares in 2018 and 2017, respectively	344	347
Additional paid-in capital	498,343	461,338
Retained earnings	619,212	668,587
Accumulated other comprehensive loss, net of tax	(38,767)	(34,599)
Total shareholders’ equity	1,079,132	1,095,673
Total liabilities and shareholders' equity	$ 1,276,310	$ 1,287,753