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International Operations and Geographic Information (Schedule of Geographic Net Sales and Location of Long-lived assets) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | $ 912,380 | $ 844,748 | $ 879,577
Long-lived assets | 246,097 | 224,190 | 239,301
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 663,600 | 615,028 | 635,923
Long-lived assets | 171,048 | 166,707 | 174,811
United Kingdom |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 44,416 | 45,184 | 59,621
Long-lived assets | 18,948 | 16,254 | 20,338
France |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 86,443 | 79,070 | 80,762
Long-lived assets | 19,324 | 16,772 | 18,755
Canada |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 52,332 | 48,357 | 44,388
Long-lived assets | 24,302 | 19,435 | 21,466
Australia |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 12,778 | 13,580 | 13,801
Long-lived assets | 917 | 1,401 | 1,189
Other |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Net sales | 52,811 | 43,529 | 45,082
Brazil |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Long-lived assets | $ 11,558 | $ 3,621 | $ 2,742

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