Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
OPERATING ACTIVITIES:
Net income	$ 41,493	$ 46,847
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	12,659	12,311
Amortization of intangibles	2,858	3,195
Stock-based compensation	3,725	3,040
Non-cash inventory charge	205	3,678
Excess tax benefit on share-based compensation	(2,246)	(3,685)
Loss (gain) on sale of assets	60	(100)
Changes in operating assets and liabilities:
Accounts receivable	(21,679)	(18,886)
Inventories	(2,150)	(1,475)
Accounts payable	7,173	5,851
Accrued expenses (including post-retirement)	(6,930)	581
Accrued payroll and severance	(3,163)	(7,437)
Accrued taxes	1,093	2,888
Prepaid expenses and other	(521)	(739)
Net cash provided by operating activities	32,577	46,069
INVESTING ACTIVITIES:
Purchases of property, plant, and equipment	(6,747)	(10,559)
Acquisition of business, net of cash acquired	(23,521)	50
Purchase of investment	(10,000)
Purchase of short-term investments	(4,616)
Proceeds from sales of short-term investments	12,401
Proceeds from sale of assets	441	253
Net cash used in investing activities	(32,042)	(10,256)
FINANCING ACTIVITIES:
Proceeds from debt	17,000	85,000
Payments of term debt		(49,000)
Payments of revolving credit facility	(17,500)	(40,000)
Debt issuance costs		(716)
Cash dividends paid	(7,806)	(6,613)
Proceeds from exercise of stock options	10,698	20,673
Excess tax benefit on share-based compensation	2,246	3,685
Net cash provided by financing activities	4,638	13,029
Effect of exchange rate changes on cash and cash equivalents	(371)	5,362
Increase in cash and cash equivalents	4,802	54,204
Cash and cash equivalents at beginning of period	164,016	109,720
Cash and cash equivalents at end of period	$ 168,818	$ 163,924