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Earnings (Losses) Per Share (Details 2)	12 Months Ended
Earnings (Losses) Per Share (Details 2)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings (Losses) Per Share
Average number of options and warrants excluded from diluted earnings (losses) per share (in shares)	12,950,249	11,642,417	14,200,915

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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