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Significant Accounting Policies Stock-based compensation (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 54 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | May 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Stock-based Compensation | $ 2,379 | $ 150 | $ 0 | $ 4,800

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