Goodwill and Other Intangible Assets (Details) (USD $)	9 Months Ended	12 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 29, 2013	Dec. 31, 2012	Sep. 29, 2013 Customer Contracts [Member]	Sep. 29, 2013 Acquired Finite-Lived Intangible Assets [Member]	Sep. 29, 2013 Patents & Trademarks [Member]	Dec. 31, 2012 Patents & Trademarks [Member]	Sep. 29, 2013 Customer Lists [Member]	Dec. 31, 2012 Customer Lists [Member]
Goodwill [Abstract]
Goodwill	$ 64,683,000	$ 65,829,000
Intangible assets, Finite-lived [Abstract]
Weighted average amortization period for acquired intangible assets subject to amortization				15 years
Finite-lived intangible assets, gross, non-current			500,000
Number of PCC satellite facilities			7
Finite-lived intangible assets, gross, current			400,000
Amortization expense			100,000
Estimated amortization expense, 2013			100,000	600,000
Estimated amortization expense, 2014			400,000	400,000
Estimated amortization expense, 2015			100,000	400,000
Estimated amortization expense, 2016				400,000
Estimated amortization expense, 2017				400,000
Estimated amortization expense, 2018				400,000
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	8,900,000	8,900,000			6,000,000	6,000,000	2,900,000	2,900,000
Accumulated amortization	$ 6,200,000	$ 5,800,000			$ 3,600,000	$ 3,400,000	$ 2,600,000	$ 2,400,000