Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 27, 2014
Operating activities
Net income	$ 104,488	$ 80,866	$ 98,100
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	33,800	29,701	29,374
Amortization of Intangible Assets	19,337	11,898	12,501
Impairment of assets	14,809		293
Provision for bad debts	1,769	164	130
Non-cash inventory charge	7,834		2,769
Net loss on pension settlement, net of tax		19,308
Loss on sale of product line	1,391
Loss on sale of property, plant, and equipment	813	1,253	1,042
Stock-based compensation	11,987	10,266	9,069
Excess tax benefit on share-based compensation	(3,421)	(1,891)	(2,843)
Deferred income taxes	(5,269)	11,479	(4,488)
Accounts receivable	(25,235)	(14,377)	(13,062)
Inventories	8,539	(3,577)	(2,258)
Accounts payable	19,190	2,573	17,281
Accrued expenses (including post-retirement)	2,287	6,482	(1,577)
Accrued payroll and severance	6,131	5,883	2,360
Accrued taxes	(18,062)	557	769
Prepaid expenses and other	(255)	5,241	3,681
Net cash provided by operating activities	180,133	165,826	153,141
Investing activities
Acquisitions of businesses, net of cash acquired	(471,118)	(4,558)	(56,368)
Purchases of short-term investments			(4,331)
Purchase of cost method investment		(3,500)
Proceeds from maturities of short-term investments	345		6,770
Decrease (increase) in entrusted loan	5,510	7,811	(17,908)
Purchases of property, plant, and equipment	(46,228)	(44,019)	(32,281)
Proceeds from sale of property, plant, and equipment	248	102	125
Net cash used in investing activities	(511,243)	(44,164)	(103,993)
Financing activities:
Proceeds of revolving credit facility	367,000	49,000	97,500
Proceeds of term loan	125,000
Proceeds of senior notes payable	226,428
Payments of term loan	(89,688)	(8,750)	(5,000)
Payments of revolving credit facility	(331,500)	(55,500)	(135,000)
Proceeds from exercise of stock options	20,494	9,150	14,061
Proceeds (Payments) from entrusted loan	(5,510)	(7,811)	17,908
Debt issuance costs	(3,583)	(42)	(107)
Cash dividends paid	(27,866)	(24,341)	(21,175)
Excess tax benefit on share-based compensation	3,421	1,891	2,843
Purchases of common stock		(31,252)	(14,283)
Net cash provided by (used in) financing activities	284,196	(67,655)	(43,253)
Effect of exchange rate changes on cash and cash equivalents	(6,748)	(22,792)	(13,516)
Increase (decrease) in cash and cash equivalents	(53,662)	31,215	(7,621)
Cash and cash equivalents at beginning of year	328,786	297,571	305,192
Cash and cash equivalents at end of year	$ 275,124	$ 328,786	$ 297,571