Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2014	Dec. 31, 2013
Derivative [Line Items]
Total outstanding derivative contracts	$ 335,908	$ 381,393
Outstanding derivative contracts maturity, maximum	2 years
Cash Flow Hedging [Member]
Derivative [Line Items]
Total outstanding derivative contracts	177,397	208,446
Balance Sheet Hedges [Member]
Derivative [Line Items]
Total outstanding derivative contracts	$ 158,511	$ 172,947