Goodwill and Other Intangible Assets (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 30, 2014		Dec. 31, 2013
Goodwill [Abstract]
Goodwill	$ 64,274,000	[1]	$ 64,432,000	[2]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,300,000		9,300,000
Accumulated Amortization	6,500,000		6,300,000
Customer Contracts [Member]
Intangible assets, Finite-lived [Abstract]
Estimated amortization expense, 2014	300,000
Estimated amortization expense, 2015	100,000
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
Acquired Finite-Lived Intangible Assets [Member]
Intangible assets, Finite-lived [Abstract]
Weighted average amortization period for acquired intangible assets subject to amortization	15 years
Estimated amortization expense, 2014	500,000
Estimated amortization expense, 2015	500,000
Estimated amortization expense, 2016	500,000
Estimated amortization expense, 2017	300,000
Estimated amortization expense, 2018	100,000
Estimated amortization expense, 2019	100,000
Patents & Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,400,000		6,400,000
Accumulated Amortization	3,800,000		3,700,000
Customer Lists [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,900,000		2,900,000
Accumulated Amortization	$ 2,700,000		$ 2,600,000

[1] Unaudited

[2] Condensed from audited financial statements