Stockholders' Equity (Details) - Reconciliation of the activity in Stockholders` Equity accounts - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2015	Sep. 27, 2014	Sep. 26, 2015	Sep. 27, 2014
Stockholders' Equity (Details) - Reconciliation of the activity in Stockholders` Equity accounts [Line Items]
Balance at December 31, 2014			$ 40,979
Net income	$ 465	$ (2,556)	4,423	$ (26,682)
Adjustment to net periodic benefit cost	(6)	$ 20	(18)	$ 59
Balance at September 26, 2015	45,959		45,959
Common Stock [Member]
Stockholders' Equity (Details) - Reconciliation of the activity in Stockholders` Equity accounts [Line Items]
Balance at December 31, 2014			$ 283
Net income
Stock-based compensation
Adjustment to net periodic benefit cost
Balance at September 26, 2015	283		$ 283
Additional Paid-in Capital [Member]
Stockholders' Equity (Details) - Reconciliation of the activity in Stockholders` Equity accounts [Line Items]
Balance at December 31, 2014			$ 16,710
Net income
Stock-based compensation			$ 539
Adjustment to net periodic benefit cost
Balance at September 26, 2015	17,249		$ 17,249
Retained Earnings [Member]
Stockholders' Equity (Details) - Reconciliation of the activity in Stockholders` Equity accounts [Line Items]
Balance at December 31, 2014			26,683
Net income			$ 4,423
Stock-based compensation
Adjustment to net periodic benefit cost
Balance at September 26, 2015	31,106		$ 31,106
AOCI Attributable to Parent [Member]
Stockholders' Equity (Details) - Reconciliation of the activity in Stockholders` Equity accounts [Line Items]
Balance at December 31, 2014			$ (2,697)
Net income
Stock-based compensation
Adjustment to net periodic benefit cost			$ 18
Balance at September 26, 2015	$ (2,679)		$ (2,679)