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Segment Reporting and Significant Customer Information - Operating Results from Continuing Operations and Assets by Business Segment (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Summary of operating results from continuing operations and assets by business segment    
Revenues $ 40,195 $ 42,177
Operating income 6,997 8,036
Europe
   
Summary of operating results from continuing operations and assets by business segment    
Revenues 13,842 12,266
North America [Member]
   
Summary of operating results from continuing operations and assets by business segment    
Revenues 26,353 29,911
Elimination
   
Summary of operating results from continuing operations and assets by business segment    
Revenues (233) (370)
Operating income 0 0
Elimination | Europe
   
Summary of operating results from continuing operations and assets by business segment    
Revenues 12 108
Elimination | North America [Member]
   
Summary of operating results from continuing operations and assets by business segment    
Revenues 221 262
Operating Segments [Member] | Europe
   
Summary of operating results from continuing operations and assets by business segment    
Revenues 13,854 12,374
Operating income 2,393 2,552
Operating Segments [Member] | North America [Member]
   
Summary of operating results from continuing operations and assets by business segment    
Revenues 26,574 30,173
Operating income $ 4,604 $ 5,484