Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
OPERATING ACTIVITIES:
Net income	$ 14,794	$ 17,563
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	6,232	6,481
Amortization of intangibles	1,572	1,468
Stock-based compensation	1,779	1,365
Non-cash inventory charge		205
Excess tax benefit on share-based compensation	(467)	(475)
(Gain) loss on sale of assets	(24)	7
Impairment and equity in net loss of unconsolidated affiliate	10,678	525
Changes in operating assets and liabilities:
Accounts receivable	(9,745)	(14,017)
Inventories	3,632	(1,713)
Accounts payable	2,452	8,552
Accrued expenses (including post-retirement)	(4,619)	(5,543)
Accrued payroll and severance	(7,319)	(7,728)
Accrued taxes	(3,946)	1,275
Prepaid expenses and other	1,026	(101)
Net cash provided by operating activities	16,045	7,864
INVESTING ACTIVITIES:
Purchases of property, plant, and equipment	(5,453)	(3,244)
Purchase of short-term investments	(8,478)	(4,616)
Proceeds from sale of assets	9	21
Net cash used in investing activities	(13,922)	(7,839)
FINANCING ACTIVITIES:
Proceeds from revolving credit facility	15,000	17,000
Payments of revolving credit facility	(5,000)	(5,500)
Cash dividends paid	(4,410)	(3,888)
Proceeds from exercise of stock options	5,283	4,217
Excess tax benefit on share-based compensation	467	475
Net cash provided by financing activities	11,340	12,304
Effect of exchange rate changes on cash and cash equivalents	(1,972)	2,347
Increase in cash and cash equivalents	11,491	14,676
Cash and cash equivalents at beginning of period	235,404	164,016
Cash and cash equivalents at end of period	$ 246,895	$ 178,692