Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 28, 2014	Jun. 30, 2015	Jun. 28, 2014
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
December 31, 2014			$ 89,181
Comprehensive income (loss) attributable to redeemable noncontrolling interest	$ (6,873)	$ (2,300)	(7,038)	$ (2,290)
Periodic adjustment to redemption value, net of currency adjustment	(178)
June 30, 2015	$ 82,130		$ 82,130