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Restructuring Charges (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Reconciliation of beginning and ending liability balances by major restructuring activity    
Balance at January 1, 2013 $ 7,224  
Restructuring charges 720 2,225
Restructuring liabilities (1,443) (809)
Balance at March 31, 2013 6,501  
Marketing & Events Group [Member]
    
Reconciliation of beginning and ending liability balances by major restructuring activity    
Restructuring charges (194) 2,003
Marketing & Events Group [Member] | Severance & Employee Benefits [Member]
    
Reconciliation of beginning and ending liability balances by major restructuring activity    
Balance at January 1, 2013 720  
Restructuring charges 1,049  
Restructuring liabilities (446)  
Balance at March 31, 2013 1,323  
Marketing & Events Group [Member] | Facilities [Member]
    
Reconciliation of beginning and ending liability balances by major restructuring activity    
Balance at January 1, 2013 5,571  
Restructuring charges 350  
Restructuring liabilities (743)  
Balance at March 31, 2013 5,178  
Other Restructurings [Member] | Severance & Employee Benefits [Member]
    
Reconciliation of beginning and ending liability balances by major restructuring activity    
Balance at January 1, 2013     
Restructuring charges 13  
Restructuring liabilities (13)  
Balance at March 31, 2013     
Other Restructurings [Member] | Facilities [Member]
    
Reconciliation of beginning and ending liability balances by major restructuring activity    
Balance at January 1, 2013 933  
Restructuring charges (692)  
Restructuring liabilities (241)  
Balance at March 31, 2013