Other Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Other Liabilities Disclosure [Abstract]
Deferred Rent Credit, Noncurrent	$ 140	$ 0
Deferred compensation	1,942	1,120
Long-term income taxes payable	7,805	2,344
Deferred service income-long term	1,291	1,458
Asset retirement obligation	2,012	1,925
Postretirement medical obligation	909	909
Other Liabilities, Noncurrent Other	225	357
Balance, end of the period	$ 14,324	$ 8,113	[1]

[1] The Balance Sheet as of December 31, 2011 has been derived from the audited financial statements at that date.