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Earnings Per Share (Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Net income (loss)	$ 1,264	$ (1,560)	$ 4,085	$ (10,202)
Weighted average shares outstanding, basic	29,766	28,167	29,526	28,051
Dilutive effect of employee equity incentive plans	2,208	0	2,075	0
Weighted average shares outstanding, diluted	31,974	28,167	31,601	28,051
Net income (loss) per share, basic	$ 0.04	$ (0.06)	$ 0.14	$ (0.36)
Net income (loss) per share, diluted	$ 0.04	$ (0.06)	$ 0.13	$ (0.36)

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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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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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