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Earnings per Share - Details of Earnings Per Share Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings per Share
Net income (loss)	$ (908)	$ 2,755	$ (118)	$ 3,438
Weighted average common shares outstanding:
Basic (in shares)	39,922	39,811	39,924	39,792
Incremental shares with dilutive effect:
Incremental shares with dilutive effect (in shares)		10		10
Diluted (in shares)	39,922	39,821	39,924	39,802
Basic (in dollars per share)	$ (0.02)	$ 0.07	$ 0.00	$ 0.09
Diluted (in dollars per share)	$ (0.02)	$ 0.07	$ 0.00	$ 0.09

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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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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