Restructuring Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Reconciliation of beginning and ending liability balances by major restructuring activity
Balance at January 1, 2012			$ 6,950
Restructuring charges	678	1,206	2,903	1,475
Cash payments			(1,938)
Adjustment to liability			(95)
Foreign currency translation adjustment			73
Balance at June 30, 2012	7,893		7,893
Marketing & Events Group Consolidation [Member]
Reconciliation of beginning and ending liability balances by major restructuring activity
Restructuring charges			2,900
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			547
Cash payments			(459)
Adjustment to liability			(95)
Foreign currency translation adjustment			73
Balance at June 30, 2012	897		897
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			2,343
Cash payments			(1,505)
Balance at June 30, 2012	5,657		5,657
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
Cash payments			(37)
Balance at June 30, 2012	0		0
Other Restructuring [Member] | Facilities [Member]
Reconciliation of beginning and ending liability balances by major restructuring activity
Balance at January 1, 2012			1,276
Cash payments			63
Balance at June 30, 2012	$ 1,339		$ 1,339