Condensed Consolidated Balance Sheets - Unaudited (USD $) In Thousands, unless otherwise specified	Mar. 29, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 138,333	$ 134,508
Accounts receivable, net	67,056	56,894
Inventories, net	28,580	27,887
Other current assets	20,741	21,112
Total current assets	254,710	240,401
Long-lived assets	70,462	71,414
Other assets
Prepaid pension asset	34,304	32,099
Goodwill	32,047	32,047
Indefinite-lived intangible asset	690	690
Intangible assets, other than goodwill	34,929	35,902
Deferred income taxes	42,586	43,120
Other assets	1,469	1,253
Total other assets	146,025	145,111
Total Assets	471,197	456,926
Current Liabilities
Accounts payable	44,168	43,343
Accrued salaries, wages and vacation	9,211	11,283
Increase in other accrued liabilities due to fair value adjustment	29,471	25,356
Total current liabilities	82,850	79,982
Long-term debt	83,200	75,000
Post retirement obligations	2,963	3,049
Other long-term obligations	9,050	9,106
Shareholders' Equity
Common stock	300,706	299,892
Additional contributed capital	39,554	39,153
Retained earnings	385,100	380,145
Accumulated other comprehensive loss	(104,165)	(104,233)
Total shareholder's equity before treasury stock	621,195	614,957
Treasury stock	(328,061)	(325,168)
Total shareholders' equity	293,134	289,789
Total Liabilities and Shareholders' Equity	$ 471,197	$ 456,926