Organization and Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 28, 2015	Mar. 29, 2014
Earnings (loss) per common share:
Anti-dilutive options excluded from computation of diluted earnings per share (in shares)		0
Basic Earnings (Loss) Per Share:
Net income (loss)	$ (14,635)	$ 1,597
Weighted average number of common shares	19,581,000	19,437,000
Earnings (loss) per common share (in dollars per share)	$ (0.75)us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic
Diluted Earnings (Loss) Per Share:
Net income (loss)	$ (14,635)	$ 1,597
Weighted average number of common shares	19,581,000	19,437,000
Incremental shares from assumed conversions of stock options		487,000
Adjusted weighted average number of common shares	19,581,000	19,924,000
Earnings (loss) per common share (in dollars per share)	$ (0.75)us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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