Accumulated Other Comprehensive Income (Loss) (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) - total	$ (2,573)
Unrealized loss on interest rate swaps, net	(892)	$ (1,014)
Reclassification of loss into earnings from interest rate swaps, net	182	83
Reclassification of net actuarial gain into earnings from postretirement benefit plans, net	(6)	(5)
Reclassification of prior service credits into earnings from postretirement benefit plans, net	(1)	$ (13)
Accumulated other comprehensive income (loss) - total	(3,290)
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	(892)
Reclassification of loss into earnings from interest rate swaps, net	182
Accumulated other comprehensive income (loss) - total	(3,563)
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	(6)
Reclassification of prior service credits into earnings from postretirement benefit plans, net	(1)
Accumulated other comprehensive income (loss) - total	$ 273