Per Common Share Amounts - Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerators:
Net (loss) income	$ (19,593)	$ (12,242)	$ (446)	$ 16,964	$ (16,056)	$ (13,407)	$ (32,281)	$ (12,499)
Income/loss attributable to unvested participating securities	(50)			(99)			(232)	(299)
Net (loss) income used in calculating earnings per common share	$ (19,643)			$ 16,865			$ (32,513)	$ (12,798)
Denominators:
Weighted average common shares outstanding - basic (in shares)	48,403			48,286			48,365	48,260
Weighted average common shares outstanding - diluted (in shares)	48,403			48,286			48,365	48,260
Net (loss) income (basic) (in dollars per share)	$ (0.41)			$ 0.35			$ (0.67)	$ (0.27)
Net (loss) income (diluted) (in dollars per share)	$ (0.41)			$ 0.35			$ (0.67)	$ (0.27)