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Segment Information Segment Information - Concentration of Credit Risk (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Concentration Risk [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Customer Concentration Risk [Member] | Sales Revenue, Segment [Member] | Customer A |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage | 19.00% | 19.00% | 20.00%
Customer Concentration Risk [Member] | Sales Revenue, Segment [Member] | Customer B |  |  |
Concentration Risk [Line Items] |  |  |
Concentration Risk, Percentage |  | 10.00% | 12.00%

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