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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%