Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2018		Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 24,573		$ 25,948
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of microwave communications equipment business			278
Depreciation and amortization	7,276		6,731
Share-based compensation expense	5,497		5,336
Amortization of inventory step-up			1,404
Deferred income taxes	(253)		(932)
Adjustment to contingent consideration liability	657		668
Changes in other accrued liabilities	(409)		427
Changes in other assets	(667)		572
(Gain) loss on disposal of assets	29		(22)
Changes in current assets and liabilities, excluding effects from acquisitions:
Accounts receivable	(8,092)		(9,013)
Inventories	(2,555)		(6,701)
Accounts payable	1,037		(3,620)
Other current assets	328		1,257
Income taxes payable	3,898		1,272
Deferred profit	(3,463)		(299)
Accrued compensation, warranty and other liabilities	1,351		303
Net cash provided by operating activities	29,207		23,609
Cash flows from investing activities, excluding effects from acquisitions:
Sales and maturities of short-term investments	59,480		39,315
Purchases of short-term investments	(38,700)		(23,665)
Cash paid for Kita, net of cash received			(11,716)
Purchases of property, plant and equipment	(2,472)		(4,739)
Cash received from sale of fixed assets	25		109
Net cash provided by (used in) investing activities	18,333		(696)
Cash flows from financing activities:
Issuance (repurchases) of common stock, net	(2,553)		7,149
Cash dividends paid	(5,217)		(4,894)
Payment of contingent consideration for Kita	(823)
Repayments of long-term debt	(975)		(1,280)
Net cash provided by (used in) financing activities	(9,568)		975
Effect of exchange rate changes on cash and cash equivalents	(1,563)		2,051
Net increase in cash and cash equivalents	36,409		25,939
Cash and cash equivalents at beginning of period	134,286	[1]	96,045
Cash and cash equivalents at end of period	170,695		121,984
Supplemental disclosure of cash flow information:
Capitalized debt issuance costs included in current other accrued liabilities	1,522
Cash paid for income taxes	3,549		3,740
Dividends declared but not yet paid	1,734		1,683
Capitalized cloud computing service costs included in accounts payable	1,044
Inventory capitalized as property, plant and equipment	514		113
Property, plant and equipment purchases included in accounts payable	$ 311		$ 594

[1] Derived from December 30, 2017 audited financial statements