Summary of Significant Accounting Policies Share Based Payments (Details)
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12 Months Ended | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Share-based Compensation, Additional Disclosures | |||
Pre-vesting forfeitures percent | 10.00% | 10.00% | 10.00% |