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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Reconciliation of beginning and ending liability balances by major restructuring activity        
Balance at January 1, 2012     $ 6,950  
Restructuring charges 608 75 3,511 1,550
Restructuring liabilities     (2,761) (3,362)
Adjustment to liability     (255)  
Foreign currency translation adjustment     29  
Balance at September 30, 2012 7,474   7,474  
Marketing & Events Group Consolidation [Member] | Severance & Employee Benefits [Member]
        
Reconciliation of beginning and ending liability balances by major restructuring activity        
Balance at January 1, 2012     831  
Restructuring charges     1,365  
Restructuring liabilities     (1,475)  
Adjustment to liability     (255)  
Balance at September 30, 2012 466   466  
Marketing & Events Group Consolidation [Member] | Facilities [Member]
        
Reconciliation of beginning and ending liability balances by major restructuring activity        
Balance at January 1, 2012     4,819  
Restructuring charges     2,133  
Restructuring liabilities     (1,096)  
Foreign currency translation adjustment     29  
Balance at September 30, 2012 5,885   5,885  
Other Restructuring [Member] | Severance & Employee Benefits [Member]
        
Reconciliation of beginning and ending liability balances by major restructuring activity        
Balance at January 1, 2012     24  
Restructuring charges     13  
Restructuring liabilities     (37)  
Balance at September 30, 2012          
Other Restructuring [Member] | Facilities [Member]
        
Reconciliation of beginning and ending liability balances by major restructuring activity        
Balance at January 1, 2012     1,276  
Restructuring liabilities     (153)  
Balance at September 30, 2012 $ 1,123   $ 1,123