Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Net loss	$ (22,193)	$ (129,660)	$ (196,696)
Other comprehensive income (loss):
Unrealized loss on note receivable	(496)	0	0
Change in supplemental executive retirement plan pension liability	4,561	(763)	(2,309)
Change in pension plan minimum liability	1,843	4,235	1,741
Total comprehensive loss	$ (16,285)	$ (126,188)	$ (197,264)