Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 26, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 2,029,773	$ 1,833,252
Less accumulated depreciation and amortization	1,151,578	1,094,267
Property and equipment, net	878,195	738,985
Land [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	134,813	106,125
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	655,487	586,903
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	1,033,967	949,975
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, at cost	$ 205,506	$ 190,249
Minimum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	10 years
Minimum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Minimum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Maximum [Member] | Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	60 years
Maximum [Member] | Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	12 years
Maximum [Member] | Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	20 years