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Summary of Significant Accounting Policies , Concentration of Credit Risk (Details) (Customer Concentration Risk [Member])
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12 Months Ended | ||
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Dec. 31, 2013
customers
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Dec. 31, 2012
customers
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Dec. 31, 2011
customers
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Accounts Receivable [Member]
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| Concentration Risk [Line Items] | |||
| Concentration risk, benchmark | 10.00% | ||
| Number of customers accounting for 10% or more of concentration risk | 1 | 0 | |
| Percentage from a single customer | 13.00% | ||
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Sales Revenue [Member]
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| Concentration Risk [Line Items] | |||
| Concentration risk, benchmark | 10.00% | ||
| Number of customers accounting for 10% or more of concentration risk | 1 | 1 | 0 |
| Percentage from a single customer | 12.00% | 11.00% | |