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Summary of Significant Accounting Policies , Revenue Recognition (Details)
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12 Months Ended |
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Dec. 31, 2013
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Minimum [Member]
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| Revenue from External Customer [Line Items] | |
| Revenue recognition period (in years) | 1 year |
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Maximum [Member]
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| Revenue from External Customer [Line Items] | |
| Revenue recognition period (in years) | 3 years |