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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net Income (Loss)	$ (15,357)	$ 2,605	$ (51,046)	$ 5,611
Denominator:
Weighted-average common shares outstanding, Basic (in shares)	107,737	110,060	108,542	110,758
Effect of potential dilutive common shares	0	2,505	0	3,333
Denominator:
Weighted-average common shares outstanding, Diluted (in shares)	107,737	112,565	108,542	114,091
Earnings Per Share, Basic	$ (0.14)	$ 0.02	$ (0.47)	$ 0.05
Earnings Per Share, Diluted	$ (0.14)	$ 0.02	$ (0.47)	$ 0.05

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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