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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Numerator:
Net loss	$ (10,781)	$ (36,980)	$ (18,764)	$ (63,556)
Denominator:
Weighted-average common shares outstanding, basic (in shares)	113,572	110,875	113,240	110,287
Effect of potential dilutive common shares	0	0	0	0
Denominator:
Weighted-average common shares outstanding, diluted (in shares)	113,572	110,875	113,240	110,287
Earnings per share, basic	$ (0.09)	$ (0.33)	$ (0.17)	$ (0.58)
Earnings per share, diluted	$ (0.09)	$ (0.33)	$ (0.17)	$ (0.58)

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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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