Restatement Not Restated (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012	Dec. 31, 2011
Accumulated Depreciation, Depletion and Amortization, Sale or Disposal of Property, Plant and Equipment							$ 8,800,000
Net income (loss)	47,390,000	36,583,000	(61,736,000)	(28,832,000)	68,952,000	117,108,000
Provision (benefit) for taxes	$ 11,660,000	$ 11,381,000	$ (23,999,000)	$ (10,158,000)	$ 17,917,000	$ 13,790,000