Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2016	Jun. 27, 2015	Jun. 25, 2016	Jun. 27, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - total			$ (2,573)
Unrealized loss on interest rate swaps, net	$ (765)	$ 677	(1,657)	$ (337)
Reclassification of loss into earnings from interest rate swaps, net	179	82	361	165
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net	(6)	(5)	(12)	(11)
Reclassification of prior service credits into earnings from postretirement benefit plans, net	(1)	$ (13)	(1)	$ (25)
Accumulated other comprehensive income (loss) - total	(3,882)		(3,882)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - total			(2,853)
Unrealized loss on interest rate swaps, net			(1,657)
Reclassification of loss into earnings from interest rate swaps, net			361
Accumulated other comprehensive income (loss) - total	(4,149)		(4,149)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - total			280
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net			(12)
Reclassification of prior service credits into earnings from postretirement benefit plans, net			(1)
Accumulated other comprehensive income (loss) - total	$ 267		$ 267