Note 8. Employee Benefits (Details) - Components of net periodic benefit cost reclassified out of Accumulated Other Comprehensive Loss (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 23, 2012	Sep. 30, 2013	Sep. 23, 2012
Components of net periodic benefit cost reclassified out of Accumulated Other Comprehensive Loss [Abstract]
Amortization of prior-service cost	$ 22		$ 68
Amortization of actuarial net loss	1,945		5,832
Total reclassifications	$ 1,967		$ 5,900