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Summary of Significant Accounting Policies Stock-Based Compensation Policy Additional Information (Details) (Employee Stock Purchase Plan [Member])
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0 Months Ended | 9 Months Ended | |
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Oct. 02, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Employee Stock Purchase Plan [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date | 5.00% | 5.00% | 15.00% |