Income Taxes - Income tax expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 26, 2019	Dec. 27, 2018
Current:
Federal	$ (32,626)	$ 1,187	$ 7,022
State	526	2,041	3,181
Deferred:
Federal	(24,751)	9,228	2,815
State	(14,085)	(136)	109
Income Tax Expense (Benefit), Total	$ (70,936)	$ 12,320	$ 13,127