Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015
Cash flows from operating activities:
Net income	$ 47,842	$ 65,344
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,681	12,063
Amortization	7,657	5,715
Stock-based compensation	11,869	10,494
Gain (loss) on disposals of property, plant and equipment and other	2	(116)
Income taxes (receivable) payable, net	(15,972)	6,547
Deferred income taxes	(2,790)	(4,785)
Decrease (increase), net of acquisitions, in:
Receivables, net	(6,003)	9,980
Inventories	(7,466)	(19,942)
Other assets	(16,861)	4,329
Increase (decrease), net of acquisitions, in:
Accounts payable	(7,747)	218
Accrued payroll liabilities	(2,184)	584
Accrued warranty reserves	676	590
Deferred revenue	8,243	6,412
Accrued restructuring and reorganization	(235)	(6,894)
Other liabilities	(1,213)	(1,555)
Net cash provided by operating activities	29,499	88,984
Cash flows from investing activities:
Decrease in restricted cash	17,507	4,392
Acquisition of property, plant and equipment	(10,790)	(7,869)
Payments for acquisitions, net of cash acquired	0	(5,377)
Purchase of investments in marketable securities	0	(48,240)
Redemption of investments in marketable securities	0	62,679
Other	(493)	(1,772)
Net cash provided by investing activities	6,224	3,813
Cash flows from financing activities:
Dividends paid on common stock	(24,518)	(20,877)
Withholding taxes paid on issuance of vested restricted stock units	(3,445)	(2,427)
Proceeds from exercise of stock options and employee stock purchases	5,895	7,873
Excess tax benefit for share based payment arrangements	308	879
Repurchases of common stock	(943)	(30,224)
Net cash used in financing activities	(22,703)	(44,776)
Effect of exchange rate changes	3,414	(15,334)
Increase in cash and cash equivalents	16,434	32,687
Cash and cash equivalents:
Beginning of period	300,911	300,507
End of period	317,345	333,194
Supplemental Cash Flow Information:
Cash paid for income taxes, net	29,197	10,597
Cash paid for interest	694	145
Increase in fixed assets related to transfers from inventories	7,407	4,077
Dividends declared but not paid	12,305	12,479
Accrued purchases of plant and equipment	791	443
Accrued repurchases of common stock	$ 0	$ 1,271