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Business Segment, Geographic and Major Customer Information - Major Customers (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Customer A [Member] |  |  |  |  |  |  |  |
Summary of revenue from major costumers |  |  |  |  |  |  |  |
Percentage of revenue by major customers | 15.50% |  | 16.60% |  | 16.60% |  | 15.20% |
Customer B [Member] |  |  |  |  |  |  |  |
Summary of revenue from major costumers |  |  |  |  |  |  |  |
Percentage of revenue by major customers |  | [1] |  | [1] |  | [1] | 10.40% |
Customer C [Member] |  |  |  |  |  |  |  |
Summary of revenue from major costumers |  |  |  |  |  |  |  |
Percentage of revenue by major customers |  | [1] | 12.10% |  |  | [1] |  | [1]
[1] | This customer did not account for more than 10% of revenue.

X
- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
Name: | us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SalesRevenueNetAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration