Per Common Share Amounts - Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerators:
Net loss	$ (12,242)	$ (446)	$ (16,056)	$ (13,407)	$ (12,688)	$ (29,463)
Income attributable to unvested participating securities	(56)		(100)		(182)	(200)
Net loss used in calculating earnings per share	$ (12,298)		$ (16,156)		$ (12,870)	$ (29,663)
Denominators:
Weighted average common shares outstanding - basic (in shares)	48,354		48,249		48,345	48,246
Weighted average common shares outstanding (diluted) (in shares)	48,354		48,249		48,345	48,246
Net loss (basic) (in dollars per share)	$ (0.25)		$ (0.33)		$ (0.27)	$ (0.61)
Net loss (diluted) (in dollars per share)	$ (0.25)		$ (0.33)		$ (0.27)	$ (0.61)