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Segment Reporting and Significant Customer Information - Operating Results from Continuing Operations and Assets by Business Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Summary of operating results from continuing operations and assets by business segment        
Revenues $ 34,064 $ 36,883 $ 70,556 $ 77,078
Operating income 2,573 10,134 6,375 17,131
North America        
Summary of operating results from continuing operations and assets by business segment        
Revenues 23,727 25,174 48,440 51,528
Operating income 2,538 3,771 4,617 8,375
Europe        
Summary of operating results from continuing operations and assets by business segment        
Revenues 10,337 11,709 22,116 25,550
Operating income 35 2,863 1,758 5,256
Operating Segments        
Summary of operating results from continuing operations and assets by business segment        
Revenues 34,064 36,883 70,556 77,078
Operating Segments | North America        
Summary of operating results from continuing operations and assets by business segment        
Revenues 23,986 25,476 48,912 52,244
Operating Segments | Europe        
Summary of operating results from continuing operations and assets by business segment        
Revenues 10,514 11,838 22,331 25,691
Elimination        
Summary of operating results from continuing operations and assets by business segment        
Revenues (436) (431) (687) (857)
Operating income 0 3,500 0 3,500
Elimination | North America        
Summary of operating results from continuing operations and assets by business segment        
Revenues 259 302 472 716
Elimination | Europe        
Summary of operating results from continuing operations and assets by business segment        
Revenues $ 177 $ 129 $ 215 $ 141