Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 26, 2022	Dec. 31, 2021
Assets
Investment in GreenFirst equity securities	$ 48,087	$ 38,510
Carrying Amount
Assets
Cash and cash equivalents	178,749	253,307
Investment in GreenFirst equity securities	48,087	38,510
Liabilities:
Fixed-rate long-term debt	921,625	919,455
Fair Value | Level 1
Assets
Cash and cash equivalents	178,749	253,307
Investment in GreenFirst equity securities	48,087	0
Liabilities:
Fixed-rate long-term debt	0	0
Fair Value | Level 2
Assets
Cash and cash equivalents	0	0
Investment in GreenFirst equity securities	0	38,510
Liabilities:
Fixed-rate long-term debt	$ 934,787	$ 964,308