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Segments (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Summary of operating results from continuing operations and assets by business segment        
Revenues from unaffiliated customers $ 41,327 $ 39,360 $ 83,504 $ 78,693
Intersegment revenues 0 0 0 0
Total net revenues 41,327 39,360 83,504 78,693
Operating income 7,794 10,366 15,829 16,937
North America
        
Summary of operating results from continuing operations and assets by business segment        
Revenues from unaffiliated customers 30,249 28,712 60,160 57,268
Intersegment revenues 331 205 575 470
Total net revenues 30,580 28,917 60,735 57,738
Operating income 5,899 7,831 11,382 14,972
Europe
        
Summary of operating results from continuing operations and assets by business segment        
Revenues from unaffiliated customers 11,078 10,648 23,344 21,425
Intersegment revenues 222 21 330 31
Total net revenues 11,300 10,669 23,674 21,456
Operating income 1,895 2,535 4,447 4,965
Elimination and Other
        
Summary of operating results from continuing operations and assets by business segment        
Revenues from unaffiliated customers 0 0 0 0 [1]
Intersegment revenues (553) (226) (905) (501) [1]
Total net revenues (553) (226) (905) (501) [1]
Operating income $ 0 $ 0 $ 0 $ (3,000) [1]
[1] Amount represents a charge related to unexchanged promotional merger shares of $3.0 million for the six months ended June 30, 2012.