Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 29, 2014	Jun. 30, 2015	Jun. 29, 2014
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ (693)	$ 42,305	$ 21,609	$ 59,954
Effective tax rate on pretax income, percent	17.50%	38.70%	39.50%	38.60%
U.S federal statutory rate, percent			35.00%	35.00%