Consolidated Balance Sheets - USD ($)	Oct. 01, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 111,349,000	$ 79,641,000
Short-term investments	273,261,000	341,194,000
Accounts receivable, less reserves of $1,279 and $873 in 2017 and 2016, respectively	121,976,000	55,438,000
Unbilled revenue	51,612,000	2,217,000
Inventories	48,061,000	26,984,000
Prepaid expenses and other current assets	38,824,000	20,870,000
Total current assets	645,083,000	526,344,000
Long-term investments	386,501,000	324,335,000
Property, plant, and equipment, net	65,957,000	53,992,000
Goodwill	113,208,000	95,280,000
Intangible assets, net	14,427,000	8,312,000
Deferred income taxes	30,524,000	28,022,000
Other assets	2,817,000	2,319,000
Total assets	1,258,517,000	1,038,604,000
Current liabilities:
Accounts payable	30,331,000	9,830,000
Accrued expenses	53,070,000	42,539,000
Accrued income taxes	10,053,000	5,193,000
Deferred revenue and customer deposits	16,072,000	8,211,000
Total current liabilities	109,526,000	65,773,000
Reserve for income taxes	5,563,000	5,361,000
Other non-current liabilities	9,905,000	4,871,000
Total liabilities	124,994,000	76,005,000
Shareholders’ equity:
Common stock, $.002 par value – Authorized: 200,000 shares in 2017 and 2016, respectively, issued and outstanding: 86,587 and 85,939 shares in 2017 and 2016, respectively	173,000	172,000
Additional paid-in capital	443,132,000	375,030,000
Retained earnings	727,319,000	643,825,000
Accumulated other comprehensive loss, net of tax	(37,101,000)	(56,428,000)
Total shareholders’ equity	1,133,523,000	962,599,000
Total liabilities and shareholders' equity	$ 1,258,517,000	$ 1,038,604,000