Leases (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Leases not yet commenced	$ 5,000
Minimum
Lessee, Lease, Description [Line Items]
Term of contracts	1 year
Term of contracts, majority	1 year
Lease extensions	3 years
Maximum
Lessee, Lease, Description [Line Items]
Term of contracts	60 years
Term of contracts, majority	8 years
Lease extensions	10 years