Restructuring (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	$ 12,314	$ 11,095	$ 12,079
Restructuring accruals	5,875	3,543	6,878
2011 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative	12,314
Number of employees	292
Restructuring accruals	5,875
2009 Initiatives [Member]
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring expenses related to restructuring initiative		11,095
Number of employees		700
Restructuring accruals		$ 3,543	$ 6,878