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Business Segments (Sales by Geographical Location) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets |  |
Net Sales | $ 626,969 | $ 536,377
United States |  |
Revenues from External Customers and Long-Lived Assets |  |
Net Sales | 484,907 | 431,868
Canada |  |
Revenues from External Customers and Long-Lived Assets |  |
Net Sales | 66,451 | 37,237
United Kingdom |  |
Revenues from External Customers and Long-Lived Assets |  |
Net Sales | 42,810 | 38,859
Other |  |
Revenues from External Customers and Long-Lived Assets |  |
Net Sales | $ 32,801 | $ 28,413

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