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Business Segment, Geographic and Major Customer Information (Details 2) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Customer A [Member] |  |  |  |  |  |  |
Summary of revenue from major costumers |  |  |  |  |  |  |
Percentage of revenue by two major customers | 16.60% | 14.60% |  | 15.20% |  | 13.70% |
Customer B [Member] |  |  |  |  |  |  |
Summary of revenue from major costumers |  |  |  |  |  |  |
Percentage of revenue by two major customers | 9.50% | 12.80% |  | 10.40% |  | 11.70% |
Customer C [Member] |  |  |  |  |  |  |
Summary of revenue from major costumers |  |  |  |  |  |  |
Percentage of revenue by two major customers | 12.10% | 5.80% | [1] | 9.80% | [1] | 4.50% | [1]
[1] | * Less than 10% of consolidated 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

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