Leases Maturity of Lease Liabilties (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 31, 2018
Finance Lease Liabilities, Payments, Due [Abstract]
Remaining 2019	$ 2,102
2020	0
2021	0
2022	0
2023	0
Thereafter	0
Total minimum lease payments	2,102
Less: amount representing interest	0
Total lease liabilities	2,102	$ 0
Operating Lease Liabilities, Payments Due [Abstract]
Remaining 2019	28,140
2020	29,017
2021	27,216
2022	26,819
2023	25,159
Thereafter	8,700
Total minimum lease payments	145,051
Less: amount representing interest	(16,623)
Total lease liabilities	$ 128,428