Derivative Financial Instruments Balance Sheet Location (Details) - Balance Sheet Location [Domain] - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014	Jun. 29, 2014
Derivatives, Fair Value [Line Items]
Derivative Liability	$ (18,806)	$ (14,649)	$ (30,110)
Derivative assets (liabilities), at fair value, net	(25,701)	(26,440)	(30,110)
Current derivative liability	6,895	11,791	0
Designated As Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), at fair value, net	18,806	14,649	11,279
Not Designated As Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative assets (liabilities), at fair value, net	(6,895)	(11,791)	(18,831)
Interest Rate Swap [Member] | Designated As Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(18,806)	(14,649)	(11,279)
Interest Rate Swap [Member] | Not Designated As Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	0	0	(18,831)
Current derivative liability	6,895	$ 11,791	$ 0
Cash Flow Hedging [Member] | Forward-Starting Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	$ 1,500