Fair Value Measurements Non-Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 30, 2018
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Assets Held and Used, Long Lived, Fair Value Disclosure	$ 0	$ 462
Assets Held-for-sale, Long Lived, Fair Value Disclosure	2,516	1,031
Total	2,516	1,493
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Assets Held and Used, Long Lived, Fair Value Disclosure	0	0
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0	0
Total	0	0
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Assets Held and Used, Long Lived, Fair Value Disclosure	0	0
Assets Held-for-sale, Long Lived, Fair Value Disclosure	0	0
Total	0	0
Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Assets Held and Used, Long Lived, Fair Value Disclosure	0	462
Assets Held-for-sale, Long Lived, Fair Value Disclosure	2,516	1,031
Total	$ 2,516	$ 1,493