Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Income (Loss) Per Common Share
Net income (loss)	$ 1,095	$ (15,533)
Net income (loss) per common share:
Basic (in dollars per share)	$ 0.03	$ (0.40)
Diluted (in dollars per share)	$ 0.03	$ (0.40)
Weighted average shares reconciliation
Basic weighted average shares outstanding	39,619	39,113
Effect of potentially dilutive share-based awards	521
Diluted weighted average shares outstanding	40,140	39,113

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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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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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