Derivative Financial Instruments Income Statement Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net effect of swaps	$ (1,407)	$ (315)	$ (1,523)	$ 56
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Amortization of Deferred Hedge Gains	1,700	2,000	3,400	4,000
Designated As Hedging [Member] | Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	446	(4,622)	(4,156)	(7,364)
Not Designated As Hedging [Member] | Interest Rate Swap [Member] | Net Effect of Swaps [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative recognized in income	$ 3,093	$ 2,301	$ 4,896	$ 3,918