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Segment Information (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Concentration Risk [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 194,061 | $ 194,061 | $ 166,961 | $ 160,180 | $ 168,514
Administrative and all other |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 135,900 | $ 135,900 | $ 87,500 | $ 113,600 |
North America | Geographic | Net Sales |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Percentage of net sales | 11.00% | 11.30% | 10.50% |  |

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