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Business Segment and Geographic Information (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 Division Countries Customers | Dec. 31, 2018 Countries Customers
Concentration Risk [Line Items] |  |
Number of business segments | Division | 2 |
Maximum Percentage Gross Trade Receivables From One Geographic Segment | 10.00% | 10.00%
Maximum Percentage Gross Trade Receivables From One Customer | 10.00% | 10.00%
Number of Countries Exceed Receivables Threshold | Countries | 1 | 1
Number of Customers Exceed Receivables Threshold | Customers | 0 | 0
Geographic Concentration Risk [Member] | Accounts Receivable [Member] | UNITED STATES |  |
Concentration Risk [Line Items] |  |
Concentration Risk, Percentage | 43.00% | 43.00%

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