Lease Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 28, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Sep. 29, 2019
Lessee, Lease, Description [Line Items]
Payments to acquire land	$ 150,300
Right-of-use asset				$ 14,324
Operating lease, liability				$ 12,771
Operating sublease, term				25 years
Operating lease, expense		$ 16,500	$ 14,800
Galveston Land
Lessee, Lease, Description [Line Items]
Right-of-use asset					$ 6,800
Operating lease, liability					$ 5,300