Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2013	Jun. 30, 2012	Jun. 29, 2013	Jun. 30, 2012
Net (loss) income	$ (3,529)	$ 36,860	$ (5,623)	$ 35,297
Other comprehensive loss:
Amortization of prior service benefit	(42)	(44)	(84)	(89)
Amortization of actuarial loss	8	7	17	14
Adjustments to net periodic benefit cost	(34)	(37)	(67)	(75)
Comprehensive (loss) income	$ (3,563)	$ 36,823	$ (5,690)	$ 35,222