Net Income (Loss) per Common Share - Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income (loss) available to common shareholders	$ 831	$ (1,399)
Weighted average common shares outstanding (shares)	122,256	120,426
Dilutive effect of equity incentive plans	$ 2,418	$ 1,150
Weighted average common shares outstanding, assuming dilution (shares)	122,286	120,446
Basic earnings per common share (usd per share)	$ 0.01	$ (0.01)
Diluted earnings per common share (usd per share)	$ 0.01	$ (0.01)

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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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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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

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