Commitments and Contingencies (Insurance) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2017
General Liability
Insurance
Insurance Maximum Coverage Per Incident	$ 300,000,000
Insurance Maximum Coverage Per Property	300,000,000
All Risk Property And Rental Value
Insurance
Insurance Maximum Coverage Per Incident	1,700,000,000
FNSIC | Terrorism Coverage Including NBCR
Insurance
Insurance Maximum Coverage Per Incident	1,700,000,000
Insurance Maximum Coverage In Aggregate	$ 1,700,000,000
Insurance Coverage End Date	December 2020
FNSIC | NBCR
Insurance
Insurance Deductible	$ 348,000
Self Insured Responsibility (in percentage)	16.00%
Federal Government Responsibility (in percentage)	84.00%
FNSIC | NBCR | Subsequent Event
Insurance
Insurance Deductible		$ 293,000
Self Insured Responsibility (in percentage)		17.00%
Federal Government Responsibility (in percentage)		83.00%