Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015
Cash flows from operating activities:
Net income	$ 22,902	$ 28,012
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,793	5,981
Amortization	3,655	2,890
Stock-based compensation	5,839	5,949
Loss on disposals of property, plant and equipment and other	(1)	(133)
Income taxes (receivable) payable, net	(13,881)	2,148
Deferred income taxes	2,941	(2,099)
Decrease (increase), net of acquisitions, in:
Receivables, net	11,126	(14,386)
Inventories	1,955	(3,876)
Other assets	(19,031)	2,185
Increase (decrease), net of acquisitions, in:
Accounts payable	1,038	(783)
Accrued payroll liabilities	(6,353)	(6,313)
Accrued warranty reserves	250	496
Deferred revenue	12,522	8,452
Accrued restructuring and reorganization	(164)	(4,958)
Other liabilities	(1,450)	(441)
Net cash provided by operating activities	28,141	23,124
Cash flows from investing activities:
Decrease in restricted cash	4,265	2,372
Acquisition of property, plant and equipment	(6,140)	(5,192)
Payments for acquisitions, net of cash acquired	0	(5,377)
Purchase of investments in marketable securities	0	(44,240)
Redemption of investments in marketable securities	0	36,619
Other	(236)	(68)
Net cash used in investing activities	(2,111)	(15,886)
Cash flows from financing activities:
Dividends paid on common stock	(12,260)	(10,450)
Withholding taxes paid on issuance of vested restricted stock units	(510)	(1,114)
Proceeds from exercise of stock options and employee stock purchases	2,826	3,705
Excess tax benefit for share based payment arrangements	99	431
Repurchases of common stock	(943)	(8,296)
Net cash used in financing activities	(10,788)	(15,724)
Effect of exchange rate changes	11,923	(23,765)
Increase (decrease) in cash and cash equivalents	27,165	(32,251)
Cash and cash equivalents:
Beginning of period	300,911	300,507
End of period	328,076	268,256
Supplemental Cash Flow Information:
Cash paid for income taxes, net	16,678	5,942
Cash paid for interest	376	59
Increase (decrease) in fixed assets related to transfers from inventories	2,394	(901)
Dividends declared but not paid	12,258	10,450
Accrued purchases of plant and equipment	1,192	398
Accrued repurchases of common stock	$ 0	$ 1,785