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International Operations and Geographic Information (Schedule of Geographic Net Sales and Location of Long-lived assets) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 628,402 $ 603,593 $ 538,548
Long-Lived Assets 97,633 104,898 105,230
United States
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 401,415 381,390 336,261
Long-Lived Assets 46,749 52,262 55,448
United Kingdom
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 40,734 39,967 36,685
Long-Lived Assets 13,809 13,511 13,757
France
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 92,964 101,124 93,130
Long-Lived Assets 25,166 26,746 29,165
Canada
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 36,190 26,029 15,325
Long-Lived Assets 11,719 12,221 6,776
Australia
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales 10,225 14,171 11,765
Long-Lived Assets 190 158 84
Other
      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net sales $ 46,874 $ 40,912 $ 45,382