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Earnings (Loss) Per Common Share (EPS) - Basic EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss)	$ 4,916	$ 10,958	$ (19,058)	$ (3,154)	$ 15,874	$ (22,212)
Average common shares outstanding (in shares)	56,061		55,406		55,890	55,326
Basic EPS (in dollars per share)	$ 0.09		$ (0.34)		$ 0.28	$ (0.40)

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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