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		6 Months Ended
	Jun. 30, 2013	Jun. 24, 2012	Jun. 30, 2013	Jun. 24, 2012
Components of net periodic benefit cost reclassified out of Accumulated Other Comprehensive Loss [Abstract]
Amortization of prior-service cost	$ 21		$ 46
Amortization of net loss	1,987		3,887
Total reclassifications	$ 2,008		$ 3,933