Income (Loss) Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income (Loss) Per Common Share
Net income (loss)	$ (19,110)	$ 19,160
Net income (loss) per common share:
Basic (in dollars per share)	$ (0.48)us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ (0.48)us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted
Basic weighted average shares outstanding	39,639	39,177
Effect of potentially dilutive share-based awards		760
Diluted weighted average shares outstanding	39,639	39,937

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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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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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