Net Income (Loss) Per Share Calculations (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Net Income (Loss) Per Share Calculations
Net income (loss) available to common stockholders	$ 1,575	$ (5,476)
Weighted average common shares outstanding, basic	47,825,000	47,756,000
Dilutive SARs (treasury method)	29,000
Weighed average common shares outstanding, dilutive	47,854,000	47,756,000
Net income (loss) per share - basic	$ 0.03us-gaap_EarningsPerShareBasic	$ (0.11)us-gaap_EarningsPerShareBasic
Net income (loss) per share - diluted	$ 0.03us-gaap_EarningsPerShareDiluted	$ (0.11)us-gaap_EarningsPerShareDiluted
Net Loss per share calculations
Dilutive SARs (treasury method)	29,000
Stock Appreciation Rights (SARs)
Net Income (Loss) Per Share Calculations
Dilutive SARs (treasury method)	65,436
Net Loss per share calculations
Dilutive SARs (treasury method)	65,436
Anti-dilutive shares		212,920

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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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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