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Income (Loss) Per Common Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income (Loss) Per Common Share
Net income (loss), Basic	$ 6,348	$ (8,302)	$ 8,842	$ (8,869)
Net income (loss), Diluted	$ 6,348	$ (8,302)	$ 8,842	$ (8,869)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.13	$ (0.17)	$ 0.18	$ (0.18)
Diluted (in dollars per share)	$ 0.12	$ (0.17)	$ 0.17	$ (0.18)
Weighted average shares reconciliation
Basic weighted average shares outstanding	48,743	48,109	48,758	48,147
Dilutive effect of share-based awards	1,707		1,553
Dilutive effect of the 2027 Notes	3,492		3,228
Diluted weighted average shares outstanding	53,942	48,109	53,539	48,147

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